Update the node engine version number

[qpre]

Currently the node engine is specified as ~0.6.6 which would lock the package to be used only with 1.0.0 (I guess) but wont allow for it to be used with recent revisions.
Could it be updated to >= 0.6.6 ?

[RohovDmytro]

@arokor maybe that's possible? Thanks in advance.

[mrmlnc]

Fixed by #6.

[gzaripov]

@arokor When will you release new version?

[arokor]

done