Update .travis.yml

Author: Dennis-van-Gils

.travis.yml

@@ -2,19 +2,18 @@ language: python
 sudo: required
 
 python:
-  - "3.6"
+  - "3.7"
 
 before_install:
   wget https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh -O miniconda.sh;
   bash ./miniconda.sh -b -p ${HOME}/miniconda;
   export PATH=${HOME}/miniconda/bin:$PATH;
-  conda install --yes python="3.6" pyqt;
-  conda install --yes numpy="1.15.0";
-  conda install --yes pyqtgraph="0.10.0";
-  conda install --yes pyserial="3.4.0";
-  conda install --yes psutil="5.4.5";
-
+  conda install --yes python="3.7" pyqt;
+  pip install -r requirements.txt
+  
 script:
   - python Arduino_PyQt_demo_with_multithreading.py
   - python Arduino_PyQt_demo_with_multithreading__minimalistic.py
   - python Arduino_PyQt_demo_without_multithreading.py
+  - python foo_bar.py
+  - python foo_baz.py