try to fix travis

remove IDE-included Adafruit_Circuit_Playground

Author: hathach

.travis.yml

@@ -46,9 +46,10 @@ install:
   # Filter only mDNS / Bonjour traffic
   - sudo iptables --insert INPUT  --jump DROP --protocol udp --dport 5353  -m comment --comment "silently drop all 5353/udp input"
   - sudo iptables --insert INPUT  --jump DROP --destination 224.0.0.251    -m comment --comment "silently drop all mDNS ipv4 broadcast"
-  # Install the nRF52 support files for arduino
+  # Install the nRF52 support files for arduino, remove IDE-included Adafruit_Circuit_Playground
   - pip3 install --user adafruit-nrfutil
   - umake electronics arduino $HOME/arduino_ide
+  - rm -rf $HOME/arduino_ide/libraries/Adafruit_Circuit_Playground
   - export PATH=$HOME/arduino_ide:$PATH
   - arduino --pref "boardsmanager.additional.urls=https://adafruit.github.io/arduino-board-index/package_adafruit_index.json" --save-prefs
   # Install BSP for tools, then remove and create symlink the git code