fix: Test examples in CI

Author: franky47

.travis.yml

@@ -9,12 +9,12 @@ os:
     - linux
 
 python:
-    - "2.7"
+    - '2.7'
 
 # Cache PlatformIO packages using Travis CI container-based infrastructure
 cache:
     directories:
-        - "~/.platformio"
+        - '~/.platformio'
 
 env:
     global:
@@ -27,6 +27,8 @@ env:
         - PLATFORMIO_CI_SRC=examples/DualMerger
         - PLATFORMIO_CI_SRC=examples/Input
         - PLATFORMIO_CI_SRC=examples/MidiUSB REQUIRES_USB=1
+        - PLATFORMIO_CI_SRC=examples/MidiUSB-CompleteAPI REQUIRES_USB=1
+        - PLATFORMIO_CI_SRC=examples/MidiUSB-Thru REQUIRES_USB=1
         - PLATFORMIO_CI_SRC=examples/RPN_NRPN
         - PLATFORMIO_CI_SRC=examples/SimpleSynth