Add changelog link

app/src/main/java/org/tasks/preferences/BasicPreferences.java

@@ -226,6 +226,8 @@ public class BasicPreferences extends InjectingPreferenceActivity
           });
     }
 
+    findPreference(R.string.changelog).setSummary(getString(R.string.version_string, BuildConfig.VERSION_NAME));
+
     requires(
         R.string.settings_localization,
         atLeastJellybeanMR1(),

app/src/main/res/values/strings.xml

@@ -884,4 +884,6 @@ File %1$s contained %2$s.\n\n
   <string name="open_map">Open map</string>
   <string name="choose_new_location">Choose new location</string>
   <string name="third_party_licenses">Third-party licenses</string>
+  <string name="changelog">Changelog</string>
+  <string name="version_string">Version %s</string>
 </resources>

app/src/main/res/xml/preferences.xml

@@ -140,6 +140,14 @@
         android:data="https://github.com/tasks/tasks"/>
     </Preference>
 
+    <Preference
+      android:key="@string/changelog"
+      android:title="@string/changelog">
+      <intent
+        android:action="android.intent.action.VIEW"
+        android:data="https://github.com/tasks/tasks/blob/master/CHANGELOG.md"/>
+    </Preference>
+
     <Preference
       android:key="@string/third_party_licenses"
       android:title="@string/third_party_licenses"/>