Bump version to 0.7.0 (wasmi-labs#238)

Propogate errno from mmap (wasmi-labs#225)

* Propogate errno from mmap

* Bump version to 0.6.1

* Fix no_std build

Bump versions for wasmi and wasmi-validation (wasmi-labs#222)

* Bump versions for wasmi and wasmi-validation in preparation for cargo publish.

Publishing a new cargo version will allow downstream crates to build in no_std
mode on rust stable (a recent change).

* Also update 'wasmi's dependency on 'wasmi-validateion'

Bump wasmi-validation

bump to 0.5

bump to 0.5

Bump version to 0.4.6.

wasmi-validation version 0.1

Bump version to 0.4.4

Bump wasmi to 0.4.3