Add handlebars as peer dependency

[yanneves]

Installing this library without handlebars leads to a Module not found error. Good use-case for npm peer dependencies.

[yanneves]

Any chance of an update for this PR?

[kennethormandy]

Hey there—I was previously under the impression that peerDependencies were getting removed in npm@3 so I didn’t make that change #4 (comment). It seems like I might have been wrong about that, and they just aren’t automatically installed with npm@3 anymore?

If that’s the case, I can merge this and tag a new release.

[yanneves]

Hey, I can understand the confusion, you're correct, the npm v3 release changes may offer a bit of clarity..

npm/npm#6930 (npm/npm#6565) peerDependencies no longer cause anything to be implicitly installed

That means on install, this plugin will warn if Handlebars is missing, but won't install Handlebars automatically or limit the install to any particular semver versions. It's designed precisely for this use-case.

[kennethormandy]

Tagged as v0.3.0, thanks!