Update changelog and version for 1.3.0 release

Author: zerowidth

doc/changelog.md

@@ -1,7 +1,9 @@
 # Changes
 
-## v1.2.1 (UNRELEASED)
+## v1.3.0 (2 April 2019)
 
+- New: Drop support for ruby <2.3
+- Fix: Build new strings instead of modifying frozen ones
 - New: Add an accessor for the configured clean block
 - New: Add a hook to use fabricated durations instead of actual timing data.
 

lib/scientist/version.rb

@@ -1,3 +1,3 @@
 module Scientist
-  VERSION = "1.2.0"
+  VERSION = "1.3.0"
 end