Removed deprecated `codecov` usage from .travis.yml CI definition

.travis.yml

@@ -53,7 +53,7 @@ before_install:
   - pip install --upgrade pip
   - pip install --upgrade wheel
   # Set numpy version first, other packages link against it
-  - pip install six nose coverage codecov pytest pytest-cov coveralls codacy-coverage parameterized secp256k1prp cryptography scrypt
+  - pip install six nose coverage pytest pytest-cov coveralls codacy-coverage parameterized secp256k1prp cryptography scrypt
   - pip install pycryptodomex  ruamel.yaml appdirs pylibscrypt tox asn1crypto diff_match_patch
   - pip install ecdsa requests websocket-client pytz six Click prettytable click_shell
 
@@ -66,7 +66,6 @@ after_success:
  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then bash util/package-osx.sh; fi
  - if [[ "$BUILD_LINUX" == "yes" ]]; then bash util/package-linux.sh; fi
  - coveralls
- - codecov 
   # - python-codacy-coverage -r coverage.xml
 
 addons: