Merge pull request #23 from StefMa/document_snapshot_version

Add SNAPSHOT version

README.md

@@ -25,6 +25,31 @@ buildscript {
 }
 ```
 
+<details>
+<summary><b>For the `master-SNAPSHOT` version click here</b></summary>
+
+```groovy
+buildscript {
+    repositories {
+        jcenter()
+        google()
+        maven { url "https://jitpack.io" }
+    }
+    dependencies {
+        classpath "com.github.stefma:bintray-release:master-SNAPSHOT"
+    }
+}
+```
+
+Please note that this may be fail for the first attempts because [JitPack](https://jitpack.io)
+build the plugin on the fly.
+Please just try it again after some minutes until JitPack have build the plugin.
+
+It can also happen that your current `master-SNAPSHOT` is locally outdated.
+If so just run `./gradlew --refresh-dependencies`.
+This will force Gradle to update all dependencies **and plugins**.
+</details>
+
 ### Configure the extensions
 Because the plugin depends heavily on the **AndroidArtifacts** plugin we have to setup **two** extensions. 
 The `androidArtifact` (resp. `javaArtifact`) and the `publish` extension which needs to be configured