Updates to the travis script

.travis.yml

@@ -4,16 +4,14 @@ services:
   - xvfb
 language: python
 cache: bundler
+
 addons:
   apt:
     packages:
       - libenchant-dev
       - python3-pyqt5
       - python3-pyqt5.qtsvg
-python:
+
-  - "3.6"
-  - "3.7"
-  - "3.8"
 install:
   - pip install --upgrade pip
   - pip install -r requirements.txt
@@ -23,10 +21,26 @@ install:
   - pip install pytest-cov
   - pip install pytest-qt
   - pip install codecov
-script:
-  - python -m pytest --cov=nw -m "project|core|gui" -v
-after_success:
-  - codecov
-after_failure:
-  - cat /sys/fs/cgroup/memory/memory.max_usage_in_bytes
 
+stages:
+  - name: Initial
+  - name: Full
+
+jobs:
+  include:
+    - stage: Initial
+      python:
+        - 3.8
+      script:
+        - python -m pytest --cov=nw -m "project|core|gui" -v
+      after_success:
+        - codecov
+      after_failure:
+        - cat /sys/fs/cgroup/memory/memory.max_usage_in_bytes
+
+    - stage: Full
+      python:
+        - 3.6
+        - 3.7
+      script:
+        - python -m pytest --cov=nw -m "project|core|gui" -v