remove redundant pip command

.github/workflows/pythonpackage.yml

@@ -23,8 +23,6 @@ jobs:
               pip install -r requirements.txt
               pip install -r requirements_dev.txt
               pip install -r requirements_tests.txt
-              pip install -r requirements_dev.txt
-              pip install -r requirements_tests.txt
       - name: Lint with flake8
         run:  |
               pip install flake8
@@ -34,5 +32,4 @@ jobs:
               flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
       - name: Test with pytest
         run:  |
-              pip install pytest
-              pytest
+              pytest

.travis.yml

@@ -2,11 +2,12 @@ dist:     xenial
 language: python
 python:
   - '3.6'
-#  - '3.7'
+  - '3.7'
 #  - '3.8'
 install:
   - pip install -r requirements.txt
   - pip install -r requirements_dev.txt
+  - pip install -r requirements_tests.txt
   - pip install -e .
 script:
   - pytest --cov=draugr