Set version to v1.4

src/main/java/amidst/minetest/world/mapgen/DefaultBiomes.java

@@ -56,6 +56,8 @@ public class DefaultBiomes {
 		if (biomeLists == null) {
 			biomeLists = new LinkedHashMap<String, MinetestBiome[]>();
 			
+			// Constructed from mapgen.lua in Master branch, where mapgen.lua last updated in ab1a79b13c on Oct 10, 2018
+			// https://github.com/minetest/minetest_game/blob/ab1a79b13c5739d73083236ca29869b60ff3b380/mods/default/mapgen.lua
 			biomeLists.put(
 				BIOMEPROFILENAME_MINETEST_GAME,
 				setIndexes(
@@ -103,7 +105,9 @@ public class DefaultBiomes {
 				)
 			);
 			
-						
+			// Constructed from mapgen.lua in backport branch, where mapgen.lua last updated in c2d1a5e on 24 Apr 2017
+			// (and the mapgen.lua file in stable-0.4 branch is identical)
+			// https://github.com/minetest/minetest_game/blob/c2d1a5ed4bebd01a1a9340d55cb2d5edf6d59df2/mods/default/mapgen.lua
 			biomeLists.put(
 				"Minetest Game v.4",
 				setIndexes(

src/main/java/amidst/minetest/world/oracle/BiomeDataOracleV5.java

@@ -45,8 +45,8 @@ public class BiomeDataOracleV5 extends MinetestBiomeDataOracle {
 	@Override
 	public short populateArray(CoordinatesInWorld corner, short[][] result, boolean useQuarterResolution) {
 
-		// FYI: at the time of writing this, the mapgen for v5 is not yet officially stable
-		// See https://forum.minetest.net/viewtopic.php?f=18&t=19132		
+		// The v5 mapgen terrain became officially stable in Minetest v5, Dec 2018
+		// See https://github.com/minetest/minetest/commit/40007351569413fd9dcff861ee00562d0c405722
 		
 		int width = result.length;
 		if (width > 0) {

src/main/resources/amidst/metadata.properties

@@ -1,7 +1,7 @@
 project.build.sourceEncoding=UTF-8
 amidst.build.jdk.version=1.8
-amidst.build.filename=amidst-minetest-v1-3c
+amidst.build.filename=amidst-minetest-v1-4
 
 amidst.version.major=1
-amidst.version.minor=3
-amidst.version.preReleaseSuffix=c
+amidst.version.minor=4
+amidst.version.preReleaseSuffix=