Access token as query parameter is deprecated (cannot fetch emails)

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Hi! 👋

Firstly, thanks for your work on this project! 🙂

Today I used [patch-package](https://github.com/ds300/patch-package) to patch `passport-github@1.1.0` for the project I'm working on.

GitHub has deprecated passing the access token as a query param and it should now be passed in the Authentication field of the headers. (https://developer.github.com/changes/2020-02-10-deprecating-auth-through-query-param/)

Here is the diff that solved my problem:

```diff
diff --git a/node_modules/passport-github/lib/strategy.js b/node_modules/passport-github/lib/strategy.js
index 0f4b07f..b036650 100644
--- a/node_modules/passport-github/lib/strategy.js
+++ b/node_modules/passport-github/lib/strategy.js
@@ -135,7 +135,8 @@ Strategy.prototype.userProfile = function(accessToken, done) {


if (self._scope && self._scope.indexOf('user:email') !== -1) {
- self._oauth2._request('GET', self._userProfileURL + '/emails', { 'Accept': 'application/vnd.github.v3+json' }, '', accessToken, function(err, body, res) {
+ self._oauth2.useAuthorizationHeaderforGET(true)
+ self._oauth2.get(self._userProfileURL + '/emails', accessToken, function(err, body, res) {
if (err) {
// If the attempt to fetch email addresses fails, return the profile
// information that was obtained.
```

This issue body was [partially generated by patch-package](https://github.com/ds300/patch-package/issues/296).

Start in node_modules/passport-github/lib/strategy.js at the userProfile email-fetching branch shown in the issue. Check how the GitHub /emails request currently passes the access token, then verify the request uses the Authentication header instead of a query parameter. Done means fetching emails works with GitHub's current authentication requirement.

Written by the indexing model from the issue text.