Update README

Author: zhxnlai

README.md

@@ -83,7 +83,31 @@ then(logger).should().log(ON_MELTED_MESSAGE)
 ~~~
 
 ### Download
-**TODO: make the jar public**
+
+While we are working on Bintray support, `StateMachine` is available via [JitPack](jitpack).
+
+##### Maven:
+```xml
+<repository>
+	<id>jitpack.io</id>
+	<url>https://jitpack.io</url>
+</repository>
+<dependency>
+	<groupId>com.github.tinder</groupId>
+	<artifactId>state-machine</artifactId>
+	<version>0.1.0</version>
+</dependency>
+```
+
+##### Gradle:
+```groovy
+repositories {
+	// ...
+	maven { url "https://jitpack.io" }
+}
+
+implementation 'com.github.tinder:state-machine:0.1.0'
+```
 
 Download [the latest JAR][latest-jar] or grab via Maven:
 ```xml