Merge pull request adafruit#1024 from ladyada/master

Update .travis.yml

Author: makermelissa

.travis.yml

@@ -15,7 +15,7 @@ cache:
 
 env:
   global:
-    - ARDUINO_IDE_VERSION="1.8.7"
+    - ARDUINO_IDE_VERSION="1.8.11"
     - PRETTYNAME="Adafruit Learning System Guides"
     - PLATFORM_CHECK_ONLY_ON_FILE=true