I managed to fix this and thought I would post this here for posterity.
I edited the file npm-shrinkwrap.json
and replaced the code block on line 1159:
"simple-recaptcha": { "version": "1.0.0", "from": "git://github.com/wzrdtales/simple-recaptcha.git#f408725106872df696436ff6a988923539ab80a6", "resolved": "git://github.com/wzrdtales/simple-recaptcha.git#f408725106872df696436ff6a988923539ab80a6" }with:
"simple-recaptcha": { "version": "1.0.0", "from": "https://github.com/wzrdtales/simple-recaptcha/archive/v1.0.0.tar.gz", "resolved": "https://github.com/wzrdtales/simple-recaptcha/archive/v1.0.0.tar.gz" }