Remove unused dependency for androidTest

Author: brarcher

app/build.gradle

@@ -37,9 +37,6 @@ android {
 
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
-    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
-        exclude group: 'com.android.support', module: 'support-annotations'
-    })
     compile 'com.android.support:appcompat-v7:27.0.2'
     compile 'com.android.support:design:27.0.2'
     compile 'com.writingminds:FFmpegAndroid:0.3.2'