defs: fix travis build

.travis.yml

@@ -12,7 +12,8 @@ python:
     - "3.5"
 
 install:
-    - pip install Pillow
+    - pip install ed25519 Pillow
+    - pip install --no-deps trezor
 
 script:
     - python coins-check.py

defs/coins/tools/coindef.py

@@ -60,7 +60,7 @@ class CoinDef(p.MessageType):
         min_address_length: int = None,
         max_address_length: int = None,
         icon: bytes = None,
-        **kwargs,
+        **kwargs
     ):
         self.coin_name = coin_name
         self.coin_shortcut = coin_shortcut