strings in switch are not supported in -source 1.6

[ghost]

Support Information:
cordova: 8.0.0
android 6.3.0

My build fails after adding this plugin. Anyone please help me out. Thanks in advance

Error:
/myProject/platforms/android/src/cordova/plugins/Diagnostic.java:1262: error: strings in switch are not supported in -source 1.6
switch(abi){
^
(use -source 7 or higher to enable strings in switch)
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: /myProject/platforms/android/src/cordova/plugins/Diagnostic.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':compileArmv7DebugJavaWithJavac'.

Compilation failed; see the compiler error output for details.

• Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

[dpa99c]

Fixed in v3.8.1 by PR #263.