A parameterless persistentHashMapOf()

[chuckjaz]

FEATURE REQUEST

A parameterless version of persistentHashMapOf() to avoid creating a useless builder and varargs parameter when the code is just going to create its own builder anyway.

fun <K, V> persistentHashMapOf(): PersistentMap<K, V> = PersistentHashMap.emptyOf<K,V>()

Parameter-less versions of persistentSetOf and persistentListOf() already exist. It seems odd that this is missing.

[qurbonzoda]

The functions was added in 0.3.2 version of the library.
Thank you for your feedback!