Added the migration script to 2.x.x

package.json

@@ -7,7 +7,8 @@
     "git-stats": "./bin/git-stats"
   },
   "scripts": {
-    "test": "node test"
+    "test": "node test",
+    "postinstall": "./scripts/migration/2.0.0.js"
   },
   "author": "Ionică Bizău <bizauionica@gmail.com>",
   "contributors": [

scripts/migration/2.0.0.js

@@ -0,0 +1,40 @@
+#!/usr/bin/env node
+
+// Dependencies
+var ReadJson = require("r-json")
+  , WriteJson = require("w-json")
+  , Abs = require("abs")
+  , Logger = require("bug-killer")
+  ;
+
+// Constants
+const DATA_FILE = Abs("~/.git-stats");
+
+function migrate() {
+    try {
+        var data = ReadJson(DATA_FILE)
+    } catch (e) {
+        if (e.code === "ENOENT") {
+            return;
+        }
+        Logger.log(e);
+    }
+
+    if (data.commits) {
+        return;
+    }
+
+    var newStats = { commits: {} };
+    Object.keys(data).forEach(function (day) {
+        var cDay = newStats.commits[day] = {};
+        Object.keys(data[day]).map(function (c) {
+            Object.keys(data[day][c]).map(function (h) {
+                cDay[h] = 1;
+            });
+        });
+    });
+
+    WriteJson(DATA_FILE, newStats);
+}
+
+migrate();