Upgrade of okhttp-ws from 2.5.0 to 2.7.5

[hosopy]

The latest version of okhttp-ws 2.X is 2.7.5.
But current build.gradle uses 2.5.0.

dependencies {
    compile 'com.squareup.okhttp:okhttp-ws:2.5.0'
    compile 'com.google.code.gson:gson:2.3.1'

    testCompile 'junit:junit:4.11'
    testCompile 'org.hamcrest:hamcrest-all:1.3'
    testCompile 'com.squareup.okhttp:mockwebserver:2.5.0'
}

Try to upgrade and test.