Increment project version to 0.1.5

Changes since the last version:

- Re-implemented the `npmap` function in `io.mandoline.utils` using the
  Claypoole library

- Fixed a race condition in `CachingChunkStore`

- Added Leon Barrett to the list of contributors in README

README.md

@@ -574,5 +574,5 @@ Credits
 -------
 Shoutouts to Brian Davis, Alice Liang, Steve Kim, and Sebastian Galkin for
 being major contributors to this project.  More shoutouts to Jeffrey
-Gerard, Tim Chagnon, Satshabad Khalsa, Daniel Richman, and Arthur Silva
-for contributing to Mandoline.
+Gerard, Tim Chagnon, Satshabad Khalsa, Daniel Richman, Arthur Silva, and
+Leon Barrett for contributing to Mandoline.

project.clj

@@ -1,4 +1,4 @@
-(defproject io.mandoline/mandoline-core "0.1.4"
+(defproject io.mandoline/mandoline-core "0.1.5"
   :description
     "Mandoline is a distributed store for multi-dimensional arrays"
   :license {:name "Apache License, version 2.0"