Do not run mypy: strict py2.7 not allows

Author: penguinolog

.travis.yml

@@ -76,14 +76,6 @@ jobs:
     - pip install --upgrade bandit
     script:
     - bandit -r exec_helpers
-  - <<: *static_analysis
-    name: "MyPy"
-    install:
-    - *upgrade_python_toolset
-    - *install_deps
-    - pip install --upgrade "mypy >= 0.641"
-    script:
-    - mypy --strict exec_helpers
 
   - <<: *code_style_check
     name: "PEP8"