Bump version to 0.15.4

Author: stevenroose

CHANGELOG.md

@@ -1,3 +1,11 @@
+
+# 0.15.4 - 2019-09-06
+
+- Add `rand-std` feature.
+- Pin the cc build-dep version to `< 1.0.42` to remain
+  compatible with rustc 1.22.0.
+- Changed all `as_*ptr()` to a new safer `CPtr` trait
+
 # 0.15.2 - 2019-08-08
 
 - Add feature `lowmemory` that reduces the EC mult window size to require

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 
 name = "secp256k1"
-version = "0.15.3"
+version = "0.15.4"
 authors = [ "Dawid Ciężarkiewicz <dpc@ucore.info>",
             "Andrew Poelstra <apoelstra@wpsoftware.net>" ]
 license = "CC0-1.0"