Small refactor (simplify formatting JDK version)

Author: guillermocalvo

japicmp/src/main/java/japicmp/util/JApiClassFileFormatVersionHelper.java

@@ -27,44 +27,9 @@ private static String getJdkVersion(int major, int minor) {
 			return "JDK 1.3";
 		} else if (major == 48) {
 			return "JDK 1.4";
-		} else if (major == 49) {
-			return "JDK 5.0";
-		} else if (major == 50) {
-			return "JDK 6";
-		} else if (major == 51) {
-			return "JDK 7";
-		} else if (major == 52) {
-			return "JDK 8";
-		} else if (major == 53) {
-			return "JDK 9";
-		} else if (major == 54) {
-			return "JDK 10";
-		} else if (major == 55) {
-			return "JDK 11";
-		} else if (major == 56) {
-			return "JDK 12";
-		} else if (major == 57) {
-			return "JDK 13";
-		} else if (major == 58) {
-			return "JDK 14";
-		} else if (major == 59) {
-			return "JDK 15";
-		} else if (major == 60) {
-			return "JDK 16";
-		} else if (major == 61) {
-			return "JDK 17";
-		} else if (major == 62) {
-			return "JDK 18";
-		} else if (major == 63) {
-			return "JDK 19";
-		} else if (major == 64) {
-			return "JDK 20";
-		} else if (major == 65) {
-			return "JDK 21";
-		} else if (major == 66) {
-			return "JDK 22";
-		} else if (major == 67) {
-			return "JDK 23";
+		} else if (major >= 49 && major <= 70) {
+			// JDK 5 to 26, according to: https://andbin.github.io/java-versions-cheat-sheet/
+			return "JDK " + (major - 44);
 		}
 		return "Version " + major + "." + minor;
 	}