Update LICENSE handling

Closes #19

README.md

@@ -15,7 +15,6 @@ In order to use this mod as a template:
         - If you are planning to include (jar-in-jar) a mod, don't forget to declare its dependency on it!
         - The icon provided here is a placeholder one. If you aren't able to replace it yet, you can delete it and remove the "icon" property
     - Create a LICENSE file for this mod! If you don't know which license to use, check out [here](https://choosealicense.com/).
-        - If you use `LICENSE.md`, don't forget to update the buildscript in order to use that file name!
         - In `quilt.mod.json`, don't forget to put the license's [SPDX identifier](https://spdx.org/licenses/) under the `"license"` property in `"metadata"`.
         - The GPLv3 and AGPLv3 are not valid mod licenses, so you can use almost any license except for those.
     - Update the Java sub-directory structure so it reflects your Maven group

build.gradle

@@ -63,10 +63,9 @@ java {
 	// withJavadocJar()
 }
 
-// If you plan to use a different file for the license, don't forget to change the file name here!
 jar {
-	from('LICENSE') {
-		rename { "${it}_${archivesBaseName}" }
+	filesMatching('LICENSE') {
+		rename '^(LICENSE.*?)(\\..*)?$', "\$1_${archivesBaseName}\$2"
 	}
 }