Use SnakeYAML version for Android

[simonpoole]

Currently MockWebServerPlus fails with

java.lang.NoClassDefFoundError: Failed resolution of: Ljava/beans/Introspector;
at org.yaml.snakeyaml.introspector.PropertyUtils.getPropertiesMap(PropertyUtils.java:63)

when used for an Android on device test. This could be avoided by using the SnakeYAML version for Android, see https://bitbucket.org/asomov/snakeyaml/wiki/Android

[sachinmeesho]

Use this-

        androidTestCompile('com.orhanobut:mockwebserverplus:1.0.0') {
		exclude module: 'snakeyaml'
	}
	androidTestCompile 'pl.droidsonroids.yaml:snakeyaml:1.18-android'

Works for me.
It just excludes snakeyaml module and 'pl.droidsonroids.yaml:snakeyaml:1.18-android' this lib gives Introspector implementation.