Added priority queue to home and features page

Author: mperry

src/jbake/content/features.adoc

@@ -19,6 +19,7 @@ Functional Java provides abstractions for the following types:
 ** Immutable, in-memory singly linked list (`fj.data.List`).
 ** Immutable lazy singly linked list (`fj.data.Stream`).
 ** A package (`fj.data.fingertrees`) providing 2-3 finger trees for a functional representation of persistent sequences, supporting access to the ends in amortized O(1) time.
+** Immutable priority queue based on finger trees (`fj.data.PriorityQueue`).
 ** Type-safe heterogeneous list (`fj.data.hlist`) for lists of elements of differing types without sacrificing type-safety.
 ** Immutable set implementation using a red/black tree (`fj.data.Set`).
 ** Immutable multi-way tree - aka rose tree (`fj.data.Tree`).

src/jbake/content/index.adoc

@@ -15,7 +15,7 @@ The library is intended for use in production applications and is thoroughly tes
 Functional Java provides abstractions for the following types:
 
 * Basic Data Structures - total and partial functions, products, unit, option, unbiased and right biased unions (either and validation), void.
-* Immutable Collections - array, list, vector, stream, set, map, finger tree, heterogenous list, difference lists.
+* Immutable Collections - array, list, vector, stream, set, map, finger tree, priority queue, heterogenous list, difference lists.
 * Other Abstractions - monoid, semigroup, natural, random number generator, reader, writer, state, input/output, parser, zipper, specification based testing, actors, concurrency, optics (lens, prism, fold, traversal and others) and type conversion.
 
 See the link:features.html[features page] for a brief description of each of these types.