Update loom dependency

[vkrasnov]

The old version depends on a pre 0.7 generator version that has the RUSTSEC-2020-0151 advisory issued, causing cargo deny to fail.

---

This change is 

[codecov[bot]]

Codecov Report

Merging #105 (764aa9c) into master (d6d1312) will decrease coverage by 0.56%. The diff coverage is n/a.

Impacted Files	Coverage Δ
src/write.rs	84.03% <0.00%> (-0.94%)	:arrow_down:

[jonhoo]

Released as 0.11.5 :tada:

[vkrasnov]

Thank you!