doc: add @jasnell and @sam-github to release team

Fixes: https://github.com/nodejs/node/issues/2416
PR-URL: https://github.com/nodejs/node/pull/2455
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

README.md

@@ -388,7 +388,9 @@ Releases of Node.js and io.js will be signed with one of the following GPG keys:
 
 * **Chris Dickinson** <christopher.s.dickinson@gmail.com>: `9554F04D7259F04124DE6B476D5A82AC7E37093B`
 * **Colin Ihrig** <cjihrig@gmail.com> `94AE36675C464D64BAFA68DD7434390BDBE9B9C5`
+* **Sam Roberts** <octetcloud@keybase.io> `0034A06D9D9B0064CE8ADF6BF1747F4AD2306D93`
 * **Jeremiah Senkpiel** <fishrock@keybase.io> `FD3A5288F042B6850C66B31F09FE44734EB7990E`
+* **James M Snell** <jasnell@keybase.io> `71DCFD284A79C3B38668286BC97EC7A07EDE3FC1`
 * **Rod Vagg** <rod@vagg.org> `DD8F2338BAE7501E3DD5AC78C273792F7D83545D`
 
 The full set of trusted release keys can be imported by running:
@@ -396,7 +398,9 @@ The full set of trusted release keys can be imported by running:
 ```
 gpg --keyserver pool.sks-keyservers.net --recv-keys 9554F04D7259F04124DE6B476D5A82AC7E37093B
 gpg --keyserver pool.sks-keyservers.net --recv-keys 94AE36675C464D64BAFA68DD7434390BDBE9B9C5
+gpg --keyserver pool.sks-keyservers.net --recv-keys 0034A06D9D9B0064CE8ADF6BF1747F4AD2306D93
 gpg --keyserver pool.sks-keyservers.net --recv-keys FD3A5288F042B6850C66B31F09FE44734EB7990E
+gpg --keyserver pool.sks-keyservers.net --recv-keys 71DCFD284A79C3B38668286BC97EC7A07EDE3FC1
 gpg --keyserver pool.sks-keyservers.net --recv-keys DD8F2338BAE7501E3DD5AC78C273792F7D83545D
 ```