Updated compat library to the latest version

Author: achmyr

Diff for: app/build.gradle

@@ -20,5 +20,5 @@ android {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    implementation 'com.android.support:appcompat-v7:21.0.3'
+    implementation 'com.android.support:appcompat-v7:28.0.0'
 }

Diff for: app/libs/fitnesse-slim.jar

@@ -1,18 +1,18 @@
 package acm.androidfitnesseexample;
 
+import android.app.Activity;
 import android.os.Bundle;
-import android.support.v7.app.ActionBarActivity;
 import android.widget.TextView;
 
-public class DefaultActivity extends ActionBarActivity implements MessageInterface {
+public class DefaultActivity extends Activity implements MessageInterface {
 
     private TextView mMessage;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_default);
-        mMessage = (TextView) findViewById(R.id.message);
+        mMessage = findViewById(R.id.message);
     }
 
     @Override