fix(ci): truthy warning and removed travis file

.travis.yml

@@ -1,47 +0,0 @@
-# simple Travis file to run style-checks until our internal CI can process external PRs
-
-language: python
-dist: xenial
-sudo: false
-python:
-  - "3.7"
-
-cache:
-  directories:
-    - $HOME/.cache/pip
-    - $HOME/.virtualenvs
-
-addons:
-  apt:
-    packages:
-      - graphviz
-
-env:
-  global:
-    PROTOBUF_VERSION=3.6.1
-
-install:
-  - pip install --upgrade pip wheel setuptools
-  - pip install poetry
-  - poetry install
-  # make sure poetry is installable without protobuf - install protoc later
-  - curl -LO "https://github.com/google/protobuf/releases/download/v${PROTOBUF_VERSION}/protoc-${PROTOBUF_VERSION}-linux-x86_64.zip"
-  - unzip "protoc-${PROTOBUF_VERSION}-linux-x86_64.zip" -d protoc
-  - curl -LO "https://github.com/editorconfig-checker/editorconfig-checker/releases/download/2.2.0/ec-linux-amd64.tar.gz"
-  - tar xfz ec-linux-amd64.tar.gz && mv bin/ec-linux-amd64 bin/editorconfig-checker
-  - export PATH="$(pwd)/bin:$(pwd)/protoc/bin:$PATH"
-
-script:
-  - poetry run make style_check
-  - poetry run make defs_check
-  - poetry run make gen_check
-  - poetry run make yaml_check
-  - ci/check_fixup.sh
-
-notifications:
-  webhooks:
-    urls:
-      - http://ci-bot.satoshilabs.com:5000/travis
-  on_success: always
-  on_failure: always
-  on_start: always

.yamllint.yml

@@ -6,6 +6,9 @@ ignore: |
   common/defs/ethereum/tokens/
 
 rules:
+  # fix for truthy warning on github action files
+  truthy:
+    allowed-values: ['true', 'false', 'on']
   # skip line length
   line-length: disable
   # skip "---" at the beginning