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"
}