Link to pro features with Google

Might be different in the future

app/build.gradle

@@ -25,6 +25,7 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
             buildConfigField "boolean", "BETA_RELEASE", "true"
             buildConfigField "boolean", "PLAY_STORE_RELEASE", "false"
+            buildConfigField "String", "PRO_FEATURES", "\"https://email.faircode.eu/#pro\""
             buildConfigField "String", "GITHUB_LATEST_API", "\"https://api.github.com/repos/M66B/open-source-email/releases/latest\""
         }
         play {
@@ -34,6 +35,7 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
             buildConfigField "boolean", "BETA_RELEASE", "true"
             buildConfigField "boolean", "PLAY_STORE_RELEASE", "true"
+            buildConfigField "String", "PRO_FEATURES", "\"https://email.faircode.eu/pro/\""
             buildConfigField "String", "GITHUB_LATEST_API", "\"\""
         }
         debug {
@@ -43,6 +45,7 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
             buildConfigField "boolean", "BETA_RELEASE", "true"
             buildConfigField "boolean", "PLAY_STORE_RELEASE", "false"
+            buildConfigField "String", "PRO_FEATURES", "\"https://email.faircode.eu/pro/\""
             buildConfigField "String", "GITHUB_LATEST_API", "\"https://api.github.com/repos/M66B/open-source-email/releases/latest\""
         }
     }

app/src/main/java/eu/faircode/email/FragmentPro.java

@@ -53,7 +53,7 @@ public class FragmentPro extends FragmentEx implements SharedPreferences.OnShare
         btnPurchase = view.findViewById(R.id.btnPurchase);
         tvPrice = view.findViewById(R.id.tvPrice);
 
-        tvList.setText(Html.fromHtml("<a href=\"https://email.faircode.eu/#pro\">" + Html.escapeHtml(getString(R.string.title_pro_list)) + "</a>"));
+        tvList.setText(Html.fromHtml("<a href=\"" + BuildConfig.PRO_FEATURES + "\">" + Html.escapeHtml(getString(R.string.title_pro_list)) + "</a>"));
         tvList.setMovementMethod(LinkMovementMethod.getInstance());
 
         btnPurchase.setOnClickListener(new View.OnClickListener() {