Add --binary when creating patch for unstaged files

Author: GrahamBorland

plugin/src/main/kotlin/org/jlleitschuh/gradle/ktlint/GitHook.kt

@@ -80,7 +80,7 @@ internal fun generateGitHook(
     echo "${'$'}CHANGED_FILES"
 
     diff=.git/unstaged-ktlint-git-hook.diff
-    git diff --color=never > ${'$'}diff
+    git diff --binary --color=never > ${'$'}diff
     if [ -s ${'$'}diff ]; then
       git apply -R ${'$'}diff
     fi