Bump version to 0.15.2

And fill in release date for 0.15.2.

Author: laanwj

CHANGELOG.md

@@ -1,9 +1,9 @@
-# 0.15.1 - ????-??-??
+# 0.15.2 - 2019-08-08
 
 - Add feature `lowmemory` that reduces the EC mult window size to require
-  significantly less memory for the validation context (~340B instead of
-  ~520kB), at the cost of slower validation. It does not affect signing, nor
-  the size of the signing context.
+  significantly less memory for the validation context (~680B instead of
+  ~520kB), at the cost of slower validation. It does not affect the speed of
+  signing, nor the size of the signing context.
 
 # 0.15.0 - 2019-07-25
 

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 
 name = "secp256k1"
-version = "0.15.1"
+version = "0.15.2"
 authors = [ "Dawid Ciężarkiewicz <dpc@ucore.info>",
             "Andrew Poelstra <apoelstra@wpsoftware.net>" ]
 license = "CC0-1.0"