v0.5.0 New features and minor GGA changes

GGA altitude now Option.
Added "strict" feature.

v0.4.0 satellites visibility sentences and more

We got major contribution: standart GSV, GSA sentences. Special mediatek-only sentence MTK, disabled by default (to enable build with mtk feature)

v0.3.0

Bumped to version 0.3.0

v0.1.0

First release.