Updated text

Fixes #104

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

@@ -228,7 +228,7 @@
     <string name="title_pro_feature">This is a pro feature</string>
     <string name="title_pro_list">List of pro features</string>
     <string name="title_pro_purchase">Buy</string>
-    <string name="title_pro_hint">Buying pro features will allow you to use all current and future pro features and will keep this app maintained and supported</string>
+    <string name="title_pro_hint">Buying pro features will allow you to use all current and future pro features, will keep this app maintained, and supported</string>
     <string name="title_pro_activated">All pro features are activated</string>
     <string name="title_pro_valid">All pro features activated</string>
     <string name="title_pro_invalid">Invalid response</string>