Build just master in continuous integration

Author: paceholder

.appveyor.yml

@@ -14,6 +14,10 @@ platform:
   - x64
   - Win32
 
+branches:
+  only:
+    - master
+
 before_build:
   - mkdir build
   - cd build

.travis.yml

@@ -7,6 +7,10 @@ compiler:
 sudo: required
 dist: trusty
 
+branches:
+  only:
+    - master
+
 env:
   #- QT_BASE=51
   #- QT_BASE=52