update NEWS for 0.3.0

NEWS.md

@@ -0,0 +1,16 @@
+# 0.3.0: March 1, 2012
+
+ - ConfigFactory methods now use the thread's context class loader
+   by default, and have overloads so you can specify a class
+   loader. Because jars may come with "reference.conf" in the jar,
+   a config must always be loaded with the same class loader as
+   the jar using the config.
+ - ConfigValue instances are now serializable
+ - new methods ConfigObject.withoutKey, ConfigObject.withOnlyKey,
+   Config.withoutPath, Config.withOnlyPath allow subsetting
+   configs more easily.
+ - better handle complex interdependent substitutions (the
+   `${foo}` syntax) without getting confused; just about anything
+   that makes conceptual sense should now work. Only inherently
+   circular config files should fail.
+ - some minor documentation fixes.

build.sbt

@@ -1,11 +1,11 @@
 
 // to release, bump major/minor/micro as appropriate,
-// drop SNAPSHOT, tag and publish.
-// add snapshot back so git master is previous release
+// update NEWS, update version in README.md, drop SNAPSHOT,
+// tag and publish.
+// then add snapshot back so git master is previous release
 // with -SNAPSHOT.
 // when releasing a SNAPSHOT to the repo, bump the micro
 // version at least.
-// Also, change the version number in the README.md
 // Versions and git tags should follow: http://semver.org/
 // except using -SNAPSHOT instead of without hyphen.