Releases are not correctly tagged

[bar]

git tag releases are not correctly tagged, they should lie in the master branch, but it is not the case.

consider ec32d94 (tag: v0.6.0) release v0.6.0 which is not "inside" the master tree and then a62f43c release v0.6.0 which is but is not tagged

* a62f43c release v0.6.0
*   8c93870 Merge pull request #10 from bninja/poly-clone
|\
| | * ec32d94 (tag: v0.6.0) release v0.6.0
| |/
| * a7b2cad release instructions
| * d0b078c clone fields for type probe
|/
*   eab1693 Merge pull request #8 from cieplak/test-coverage