[DEST-1291][DAND-9] Bumps Firebase SDK version and updates readme. (#25)

* DAND-9-Update: Bump firebase-analytics to 17.2.1

Author: brennan

CHANGELOG.md

@@ -1,3 +1,8 @@
+2.0.0 / 2019-11-15
+==================
+*(Supports Android 29+ and Gradle 3.2.1+)*
+
+  * Bump Firebase to 17.2.1
 
 1.4.0 / 2019-09-09
 ==================

README.md

@@ -14,6 +14,13 @@ To install the Segment-Firebase integration, simply add this line to your gradle
 compile 'com.segment.analytics.android.integrations:firebase:+'
 ```
 
+### Note
+To use firebase-integrations 1.4.+ :
+* `Update your app to use (AndroidX) or Android 29`
+* `Upgrade com.android.tools.build:gradle to v3.2.1 or later`
+
+For Android 28 or Lower: [here](https://search.maven.org/artifact/com.segment.analytics.android.integrations/firebase/1.2.0/aar)
+
 Don't forget to add the following dependencies to make sure [Firebase works](https://firebase.google.com/docs/android/setup/):
 ```
 apply plugin: 'com.android.application'

build.gradle

@@ -55,7 +55,7 @@ dependencies {
   }
 
   api 'com.segment.analytics.android:analytics:4.3.1'
-  implementation 'com.google.firebase:firebase-analytics:17.2.0'
+  implementation 'com.google.firebase:firebase-analytics:17.2.1'
 
   testImplementation 'com.segment.analytics.android:analytics-tests:4.3.1'
   testImplementation 'junit:junit:4.12'

gradle.properties

@@ -1,6 +1,6 @@
 GROUP=com.segment.analytics.android.integrations
 
-VERSION=1.4.0-SNAPSHOT
+VERSION=2.0.0-SNAPSHOT
 
 POM_ARTIFACT_ID=firebase
 POM_PACKAGING=aar