Add python 3.8 builds

Author: wiktorn

.travis.yml

@@ -78,6 +78,13 @@ matrix:
       env:
         - MB_PYTHON_VERSION=3.7
         - PLAT=i686
+    - os: linux
+      env:
+        - MB_PYTHON_VERSION=3.8
+    - os: linux
+      env:
+        - MB_PYTHON_VERSION=3.8
+        - PLAT=i686
     - os: osx
       language: generic
       env:
@@ -94,6 +101,10 @@ matrix:
       language: generic
       env:
         - MB_PYTHON_VERSION=3.7
+    - os: osx
+      language: generic
+      env:
+        - MB_PYTHON_VERSION=3.8
     - os: osx
       language: generic
       env: