Add support of apostrophe style comments for plantuml (#42)

diff --git a/assets/languages.yaml b/assets/languages.yaml
index 46035cd..42dac54 100644
--- a/assets/languages.yaml
+++ b/assets/languages.yaml
@@ -4192,6 +4192,7 @@
   tm_scope: source.wsd
   ace_mode: text
   language_id: 833504686
+  comment_style_id: Apostrophe
 Pod:
   type: prose
   ace_mode: perl
diff --git a/assets/styles.yaml b/assets/styles.yaml
index 2109470..6d971f2 100644
--- a/assets/styles.yaml
+++ b/assets/styles.yaml
@@ -96,4 +96,9 @@
   middle: ' *'
   end: ' */'
   ensure_after: '<?php'
-  ensure_before: '?>'
\ No newline at end of file
+  ensure_before: '?>'
+
+- id: Apostrophe
+  start: "'"
+  middle: "'"
+  end: "'"
diff --git a/pkg/license/norm.go b/pkg/license/norm.go
index 75fd1ab..96dbd80 100644
--- a/pkg/license/norm.go
+++ b/pkg/license/norm.go
@@ -71,6 +71,7 @@
 		regexp.MustCompile(`(?m)^\s*#+}`),    // #}
 		regexp.MustCompile(`(?m)^\s*{\*+`),   // {*
 		regexp.MustCompile(`(?m)^\s*\*+}`),   // *}
+		regexp.MustCompile(`(?m)^\s*'+`),     // '
 	}
 
 	flattenSpace = regexp.MustCompile(`\s+`)