Updating colabs to point to master in preparation for release

ImageColorizerColab.ipynb

@@ -83,8 +83,7 @@
    },
    "outputs": [],
    "source": [
-    "!git clone -b FastAIv1 --single-branch https://github.com/jantic/DeOldify.git DeOldify\n",
-    "#!git clone https://github.com/jantic/DeOldify.git DeOldify "
+    "!git clone https://github.com/jantic/DeOldify.git DeOldify "
    ]
   },
   {

VideoColorizerColab.ipynb

@@ -86,8 +86,7 @@
    },
    "outputs": [],
    "source": [
-    "!git clone -b FastAIv1 --single-branch https://github.com/jantic/DeOldify.git DeOldify\n",
-    "#!git clone https://github.com/jantic/DeOldify.git DeOldify"
+    "!git clone https://github.com/jantic/DeOldify.git DeOldify"
    ]
   },
   {