Updating version to 0.3.1

Summary:
This release supports following features: -
- Packing translations of multiple locales together in same `.pack` file
- Fallback to a different locale if a translation is not available in desired locale
- Locales with Regions, for example, `zh-TW`

Reviewed By: Ider

Differential Revision: D30319949

fbshipit-source-id: 978064f

README.md

@@ -45,7 +45,7 @@ Check out [our tech talk on StringPacks from DroiCon SF 2019](https://youtu.be/n
    dependencies {
      ...
      ...
-     implementation 'com.whatsapp.stringpacks:stringpacks:0.3.0'
+     implementation 'com.whatsapp.stringpacks:stringpacks:0.3.1'
    }
    ```
 6. To remove old `.pack` files from the device's internal storage, on every app upgrade, add [MyPackageReplacedReceiver.java](library/src/main/java/com/whatsapp/stringpacks/receiver/MyPackageReplacedReceiver.java) and [PackFileDeletionService.java](library/src/main/java/com/whatsapp/stringpacks/service/PackFileDeletionService.java) to your `AndroidManifest.xml`

library/gradle.properties

@@ -9,7 +9,7 @@ android.useAndroidX=true
 
 ## Maven specific properties
 GROUP=com.whatsapp.stringpacks
-LIBRARY_VERSION_NAME=0.3.0
+LIBRARY_VERSION_NAME=0.3.1
 
 # Maven artifact information
 POM_ARTIFACT_ID=stringpacks

sample/app/build.gradle

@@ -43,7 +43,7 @@ android {
 
 dependencies {
     // Uncomment it for testing when a new version is published to maven
-    // implementation 'com.whatsapp.stringpacks:stringpacks:0.3.0'
+    // implementation 'com.whatsapp.stringpacks:stringpacks:0.3.1'
     implementation project(':library')
     implementation 'androidx.appcompat:appcompat:1.2.0'
     testImplementation 'junit:junit:4.12'