chore(version-up): v2.0.1

This time with official python 3.6 support

chore(version-up): v2.0.1

Close memviews on `to_bytes(), no PY25 global mman`.

fix leaks_memview: smmap2: yes, me: no

FIX memoryview leak, BREAK stream hierarchy, consts utils.

Restore LazyMixin in packers - no siginificant delay in the end.

FIX with `mman.collect()` and partially HIDE 2 remaining erors.

Retrofitted API to use `with ...` resource handling.

chore(rename): gitdb2 v2.0

v2 is chosen to better match the name.

Fixes an issue that could cause pack access to hang while iterating t…

…hrough pack objects ...