Update README.md

to be clearer on sass versions

Bump version

Merge pull request #151 from eduardoboucas/1.4.9

v1.4.9

Merge pull request #141 from eduardoboucas/revert_d2188bc2f34bef4bb35…

…c566e0b496dd23813d70a

Bump version

Bump version

Merge pull request #135 from eduardoboucas/chore/v1.4.6

Bump version

Merge pull request #133 from eduardoboucas/chore/v1.4.5

Bump version to 1.4.5

Bumped version to 1.4.4

Bump version (continued)

Merge pull request #106 from hinok/fix/media-context

Fix broken media-context mixin