revert: fix: make sure manifest writes don't overlap (d6a20cf)

[mastilver]

closes #72

[codecov-io]

Codecov Report

Merging #73 into 1.x will decrease coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              1.x      #73      +/-   ##
==========================================
- Coverage   98.66%   98.63%   -0.04%     
==========================================
  Files           2        2              
  Lines          75       73       -2     
==========================================
- Hits           74       72       -2     
  Misses          1        1

Impacted Files	Coverage Δ
lib/plugin.js	98.61% <100%> (-0.04%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 02cbd20...67c4c63. Read the comment docs.