pipenv: add black and isort

Pipfile

@@ -5,6 +5,12 @@ verify_ssl = true
 
 [packages]
 trezor = {git = "https://github.com/trezor/python-trezor", editable = true, ref = "master"}
+protobuf = "==3.4.0"
 pytest = "*"
 mock = "*"
-protobuf = "==3.4.0"
+isort = "*"
+flake8 = "*"
+black = "*"
+
+[pipenv]
+allow_prereleases = true

Pipfile.lock

@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "b4eae29eaeaf82e3804fd1c8bf192feeadd4c2c6e6de3f647e999c0c915ada66"
+            "sha256": "5f20a0fc83eb2b29a6c724b4792d3e648eb3284ec15679aac24bca993f5af2cf"
         },
         "pipfile-spec": 6,
         "requires": {},
@@ -14,6 +14,13 @@
         ]
     },
     "default": {
+        "appdirs": {
+            "hashes": [
+                "sha256:9e5896d1372858f8dd3344faf4e5014d21849c756c8d5701f78f8a103b372d92",
+                "sha256:d8b24664561d0d34ddfaec54636d502d7cea6e29c3eaf68f3df6180863e2166e"
+            ],
+            "version": "==1.4.3"
+        },
         "atomicwrites": {
             "hashes": [
                 "sha256:240831ea22da9ab882b551b31d4225591e5e447a68c5e188db5b89ca1d487585",
@@ -28,6 +35,14 @@
             ],
             "version": "==18.1.0"
         },
+        "black": {
+            "hashes": [
+                "sha256:22158b89c1a6b4eb333a1e65e791a3f8b998cf3b11ae094adb2570f31f769a44",
+                "sha256:4b475bbd528acce094c503a3d2dbc2d05a4075f6d0ef7d9e7514518e14cc5191"
+            ],
+            "index": "pypi",
+            "version": "==18.6b4"
+        },
         "certifi": {
             "hashes": [
                 "sha256:13e698f54293db9f89122b0581843a782ad0934a4fe0172d2a980ba77fc61bb7",
@@ -56,6 +71,14 @@
             ],
             "version": "==0.13"
         },
+        "flake8": {
+            "hashes": [
+                "sha256:7253265f7abd8b313e3892944044a365e3f4ac3fcdcfb4298f55ee9ddf188ba0",
+                "sha256:c7841163e2b576d435799169b78703ad6ac1bbb0f199994fc05f700b2a90ea37"
+            ],
+            "index": "pypi",
+            "version": "==3.5.0"
+        },
         "idna": {
             "hashes": [
                 "sha256:156a6814fb5ac1fc6850fb002e0852d56c0c8d2531923a51032d1b70760e186e",
@@ -63,12 +86,28 @@
             ],
             "version": "==2.7"
         },
+        "isort": {
+            "hashes": [
+                "sha256:1153601da39a25b14ddc54955dbbacbb6b2d19135386699e2ad58517953b34af",
+                "sha256:b9c40e9750f3d77e6e4d441d8b0266cf555e7cdabdcff33c4fd06366ca761ef8",
+                "sha256:ec9ef8f4a9bc6f71eec99e1806bfa2de401650d996c59330782b89a5555c1497"
+            ],
+            "index": "pypi",
+            "version": "==4.3.4"
+        },
         "libusb1": {
             "hashes": [
                 "sha256:8c930d9c1d037d9c83924c82608aa6a1adcaa01ca0e4a23ee0e8e18d7eee670d"
             ],
             "version": "==1.6.4"
         },
+        "mccabe": {
+            "hashes": [
+                "sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42",
+                "sha256:dd8d182285a0fe56bace7f45b5e7d1a6ebcbf524e8f3bd87eb0f125271b8831f"
+            ],
+            "version": "==0.6.1"
+        },
         "mnemonic": {
             "hashes": [
                 "sha256:02a7306a792370f4a0c106c2cf1ce5a0c84b9dbd7e71c6792fdb9ad88a727f1d"
@@ -147,6 +186,20 @@
             ],
             "version": "==1.1.2"
         },
+        "pycodestyle": {
+            "hashes": [
+                "sha256:682256a5b318149ca0d2a9185d365d8864a768a28db66a84a2ea946bcc426766",
+                "sha256:6c4245ade1edfad79c3446fadfc96b0de2759662dc29d07d80a6f27ad1ca6ba9"
+            ],
+            "version": "==2.3.1"
+        },
+        "pyflakes": {
+            "hashes": [
+                "sha256:08bd6a50edf8cffa9fa09a463063c425ecaaf10d1eb0335a7e8b1401aef89e6f",
+                "sha256:8d616a382f243dbf19b54743f280b80198be0bca3a5396f1d2e1fca6223e8805"
+            ],
+            "version": "==1.6.0"
+        },
         "pytest": {
             "hashes": [
                 "sha256:0453c8676c2bee6feb0434748b068d5510273a916295fd61d306c4f22fbfd752",
@@ -169,19 +222,17 @@
             ],
             "version": "==1.11.0"
         },
+        "toml": {
+            "hashes": [
+                "sha256:8e86bd6ce8cc11b9620cb637466453d94f5d57ad86f17e98a98d1f73e3baab2d"
+            ],
+            "version": "==0.9.4"
+        },
         "trezor": {
             "editable": true,
             "git": "https://github.com/trezor/python-trezor",
             "ref": "master"
         },
-        "typing": {
-            "hashes": [
-                "sha256:3a887b021a77b292e151afb75323dea88a7bc1b3dfa92176cff8e44c8b68bddf",
-                "sha256:b2c689d54e1144bbcfd191b0832980a21c2dbcf7b5ff7a66248a60c90e951eb8",
-                "sha256:d400a9344254803a2368533e4533a4200d21eb7b6b729c173bc38201a74db3f2"
-            ],
-            "version": "==3.6.4"
-        },
         "urllib3": {
             "hashes": [
                 "sha256:a68ac5e15e76e7e5dd2b8f94007233e01effe3e50e8daddf69acfd81cb686baf",