#1547 Remove usage of crypto libraries

src/diagrams/git/gitGraphAst.js

@@ -1,5 +1,5 @@
 import { logger } from '../../logger';
-
+import { random } from '../../utils';
 let commits = {};
 let head = null;
 let branches = { master: head };
@@ -7,18 +7,8 @@ let curBranch = 'master';
 let direction = 'LR';
 let seq = 0;
 
-function makeid(length) {
-  var result = '';
-  var characters = '0123456789abcdef';
-  var charactersLength = characters.length;
-  for (var i = 0; i < length; i++) {
-    result += characters.charAt(Math.floor(Math.random() * charactersLength));
-  }
-  return result;
-}
-
 function getId() {
-  return makeid(7);
+  return random({ length: 7 });
 }
 
 function isfastforwardable(currentCommit, otherCommit) {