Update .travis.yml to use poetry for build

.travis.yml

@@ -40,14 +40,14 @@ addons:
             - cython3
             - ccache
 install:
-    - pip install pipenv pysdl2 python-bitcoinrpc protobuf
+    - pip install pipenv pysdl2 python-bitcoinrpc protobuf poetry
     # From trezor-mcu to get the correct protobuf version
     - curl -LO "https://github.com/google/protobuf/releases/download/v3.4.0/protoc-3.4.0-linux-x86_64.zip"
     - unzip "protoc-3.4.0-linux-x86_64.zip" -d protoc
     - export PATH="$(pwd)/protoc/bin:$PATH"
     # Build emulators/simulators and bitcoind
     - cd test; ./setup_environment.sh; cd ..
     - pip uninstall -y trezor # Hack to get rid of master branch version of trezor that is installed for trezor-mcu build
-    - python setup.py install
+    - poetry install
 script:
-    - cd test; ./run_tests.py
+    - cd test; poetry run ./run_tests.py