Fix apt-get update -q causing build to fail (#20)

`sudo apt-get update -q` can fail a site doesn't respond.
This is the solution proposed here:
Related travis-ci/travis-ci#5221

.travis.yml

@@ -4,7 +4,7 @@ language: java
 
 before_install:
   - sudo add-apt-repository ppa:wpilib/toolchain -y
-  - sudo apt-get update -q
+  - sudo apt-get update -q || true
   - sudo apt-get install frc-toolchain -y
 
 
@@ -13,4 +13,4 @@ before_cache:
 cache:
   directories:
     - $HOME/.gradle/caches/
-    - $HOME/.gradle/wrapper/
+    - $HOME/.gradle/wrapper/