Update README.md to include -c/--custom argument

Author: yasht01

README.md

@@ -44,6 +44,7 @@ Options: <br>
 `-v, --version -> Gives the Version of the CLI` <br>
 `-s, --search -> Search a question on Stackoverflow` <br>
 `-d, --debug -> Turn on Debugging mode` <br>
+`-c, --custom -> Setup a custom API key` <br>
 `-h, --help -> Shows this message and exit` <br>
 
 ## License🗄

src/arguments/utility.py

@@ -117,7 +117,7 @@ def setCustomKey(self):
         callback_url = input("Paste URL after authenticating here: ")
         accessTokenData = stackApps.token_from_fragment(callback_url)
 
-        # Store the access token data in a JSON file
+        # Store the access token data in a dictionary
         jsonDict = {
             "access_token": accessTokenData['access_token'],
             "expires": accessTokenData['expires'],