Adding travis_wait for timing out Travis CI jobs (#416)

Author: czgdp1807

.travis.yml

@@ -3,12 +3,12 @@ sudo: false
 language: python
 
 python:
-        - "3.6"
+        - "3.8"
 install:
-        - pip install -r requirements.txt
+        - travis_wait 60 pip install -r requirements.txt
 
 script:
-        - python -m pytest --doctest-modules --cov=./ --cov-report=xml -s
+        - travis_wait 60 python -m pytest --doctest-modules --cov=./ --cov-report=xml -s
 
 after_success:
         - codecov