Use "var" instead of "let"

[netes]

Latest release (0.3.1) introduced use of let in 2 places which resulted in this error:

SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode

when Node < 6. I've changed them to var to keep addon compatible with older Node versions.

[ivanvanderbyl]

Thanks @netes

[onlymejosh]

@ivanvanderbyl can you release a new version please. As I'm currently having to peg the release to a commit :/

[ivanvanderbyl]

@onlymejosh just shipped 0.3.2

[onlymejosh]

Wow that was quick! Thank you :)

…

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