Release v0.4.0

What's Changed

• Implement suffle() and shuffle(RandomGenerator)
• Implement filterWithIndex()
• Implement runningProduct() and runningProductBy()
• Implement runningSum() and runningSumBy()
• Remove concat() implementation (the JDK has this)
• Remove withIndexStartingAt(), not sure if this is a real use case.

Using in Maven

<dependency>
    <groupId>com.ginsberg</groupId>
    <artifactId>gatherers4j</artifactId>
    <version>0.4.0</version>
</dependency>

Using in Gradle

implementation("com.ginsberg:gatherers4j:0.4.0")