fix alfheim crash (#72)

Add publishing notes to developer docs

docs/developer-usage.md

@@ -1,5 +1,9 @@
 # Developer usage
 
+To publish a release, you must publish a **draft release** (not pre-release) on GitHub. Make sure to create a tag (or pick the latest one if you screwed up the release), autogenerate (or manually write, I suppose) the description, and set it as the latest release. 
+
+If that doesn't get the GH action to build the mod, attach it to the release, and mark it un-draft, please figure out what broke and correct this section.
+
 An example mod showcasing the mod's various features is available in the `example-*` branches of the repo:
 - [`example-fg-g4`](https://github.com/LegacyModdingMC/UniMixins/tree/example-fg-g4) - ForgeGradle-based build script with Gradle 4
 - [`example-fg-g6`](https://github.com/LegacyModdingMC/UniMixins/tree/example-fg-g6) - ForgeGradle-based build script with Gradle 6

module-all/build.gradle

@@ -147,7 +147,7 @@ tasks.withType(ShadowJar) {
 				'FMLCorePluginContainsFMLMod': true,
 				'ForceLoadAsMod': true,
 				'FMLCorePlugin': 'io.github.legacymoddingmc.unimixins.all.AllCore',
-				'MixinConfigs': 'mixins.gtnhmixins.json,mixingasm.mixin.json',
+				'MixinConfigs': 'mixins.gtnhmixins.json,mixingasm.init.mixin.json,mixingasm.mixin.json',
 				'Premain-Class': 'org.spongepowered.tools.agent.MixinAgent',
 				'Agent-Class': 'org.spongepowered.tools.agent.MixinAgent',
 				'Can-Redefine-Classes': true,

module-mixingasm/build.gradle

@@ -21,7 +21,7 @@ shadowJar {
 			'TweakClass': 'org.spongepowered.asm.launch.MixinTweaker',
 			'FMLCorePluginContainsFMLMod': true,
 			'ForceLoadAsMod': true,
-			'MixinConfigs': 'mixingasm.mixin.json',
+			'MixinConfigs': 'mixingasm.init.mixin.json,mixingasm.mixin.json',
 			'TweakOrder': 0,
 		)
 	}

module-mixingasm/src/main/resources/mixingasm.init.mixin.json

@@ -0,0 +1,9 @@
+{
+  "required": true,
+  "minVersion": "0.6",
+  "target": "@env(INIT)",
+  "package": "makamys.mixingasm.mixin",
+  "compatibilityLevel": "JAVA_8",
+  "mixins": [],
+  "plugin": "makamys.mixingasm.MixinConfigPlugin"
+}