Update Travis software versions

Using latest: Arduino 1.8.12 and Teensyduino 152. This makes the CI builds current, but introduces the Java socket issue that spams the CI build log.

Author: dmadison

.travis.yml

@@ -1,8 +1,8 @@
 language: C
 env:
   global:
-    - IDE_VERSION=1.8.1
-    - TEENSY_VERSION=145
+    - IDE_VERSION=1.8.12
+    - TEENSY_VERSION=152
     - BOARDS_DESTINATION=/usr/local/share/arduino/hardware
 matrix:
   include: