Add Install Intercom without Push Messaging (#267)

Add Install Intercom without Push Messaging to README

Author: watadarkstar

README.md

@@ -150,7 +150,9 @@ React Native wrapper for Intercom.io. Based off of [intercom-cordova](https://gi
         }
         ```
 
-    1. Decide which type of push messaging you want to install, and add choosen method to `android/app/build.gradle`. If "Google Cloud Messaging (GCM)", then:
+    1. Decide which type of push messaging you want to install, and add choosen method to `android/app/build.gradle`. 
+    
+        If "Google Cloud Messaging (GCM)", then:
 
         ```gradle
         dependencies {
@@ -171,6 +173,13 @@ React Native wrapper for Intercom.io. Based off of [intercom-cordova](https://gi
           compile 'com.google.firebase:firebase-messaging:11.+'
         }
         ```
+        If you'd rather not have push notifications in your app, you can use this dependency:
+
+        ```gradle
+        dependencies {
+            implementation 'io.intercom.android:intercom-sdk-base:5.+'
+        }
+        ```
 
 1. Import Intercom and use methods