Update arduino-cli binary filename

The arduino-cli binary filename was recently changed, which broke CI builds:

mv: cannot stat ‘arduino-cli-*-linux64’: No such file or directory

Author: per1234

Diff for: .travis.yml

@@ -45,7 +45,7 @@ before_install:
   - wget http://downloads.arduino.cc/arduino-cli/arduino-cli-$CLI_VERSION-linux64.tar.bz2
   - tar xf arduino-cli-$CLI_VERSION-linux64.tar.bz2
   - mkdir -p "$HOME/bin"
-  - mv arduino-cli-*-linux64 $HOME/bin/arduino-cli
+  - mv arduino-cli $HOME/bin
   - export PATH="$PATH:$HOME/bin"
   - arduino-cli core update-index
   - if [[ "$BOARD" =~ "arduino:samd:" ]]; then