Set version to 0.1.3 for release build

Originally used version 1.0.0 - 1.0.2 as this was a mod
which I had no intentions of releasing but have decided
to move the major version to 0 to create an beta release
version for others to download and use with no expectation
for stability.

Because version 1.0.0 - 1.0.2 were never officially
released publicly I have no concerns about moving the
version backwards at risk of conflicting in future.

gradle.properties

@@ -9,7 +9,7 @@ org.gradle.jvmargs=-Xmx1G
  carpet_core_version=1.4.20+v201202
 
 # Mod Properties
- mod_version = 1.0.2
+ mod_version = 0.1.3
  maven_group = totos-carpet-tweaks
  archives_base_name = totos-carpet-tweaks