Added back license

src/main/java/me/shedaniel/rei/api/ItemStackRenderOverlayHook.java

@@ -1,3 +1,8 @@
+/*
+ * Roughly Enough Items by Danielshe.
+ * Licensed under the MIT License.
+ */
+
 package me.shedaniel.rei.api;
 
 public interface ItemStackRenderOverlayHook {

src/main/java/me/shedaniel/rei/mixin/MixinItemStack.java

@@ -1,3 +1,8 @@
+/*
+ * Roughly Enough Items by Danielshe.
+ * Licensed under the MIT License.
+ */
+
 package me.shedaniel.rei.mixin;
 
 import me.shedaniel.rei.api.ItemStackRenderOverlayHook;