Fix git graph default style issue

dist/demo/index.html

@@ -65,9 +65,8 @@ Add another diagram to demo page    : 48h
 gitGraph :
 options
 {
-    "key": "value",
-    "nodeWidth": 150,
-    "nodeSpacing" : 150
+    "nodeSpacing" : 150,
+    "nodeRadius": 10
 }
 end
     commit

src/diagrams/gitGraph/gitGraphRenderer.js

@@ -8,7 +8,7 @@ const log = Logger.Log
 var allCommitsDict = {}
 var branchNum
 var config = {
-  nodeSpacing: 75,
+  nodeSpacing: 150,
   nodeFillColor: 'yellow',
   nodeStrokeWidth: 2,
   nodeStrokeColor: 'grey',
@@ -17,12 +17,12 @@ var config = {
   lineColor: 'grey',
   leftMargin: 50,
   branchColors: ['#442f74', '#983351', '#609732', '#AA9A39'],
-  nodeRadius: 15,
+  nodeRadius: 10,
   nodeLabel: {
     width: 75,
     height: 100,
     x: -25,
-    y: 15
+    y: 0
   }
 }
 var apiConfig = {}