Remove globalThis (fixes #641).

[kestarumper]

In #619 we added globalThis but it appears not to be widely supported nor automatically polyfilled.

Related issue: #641

[codecov]

Codecov Report

Merging #645 into master will decrease coverage by 0.28%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #645      +/-   ##
==========================================
- Coverage    99.6%   99.32%   -0.29%     
==========================================
  Files         163      163              
  Lines        1782     1782              
  Branches      547      552       +5     
==========================================
- Hits         1775     1770       -5     
  Misses          1        1              
- Partials        6       11       +5

Impacted Files	Coverage Δ
packages/uniforms-semantic/src/DateField.tsx	93.75% <0%> (-6.25%)	⬇️
packages/uniforms-material/src/DateField.tsx	92.3% <0%> (-7.7%)	⬇️
packages/uniforms-unstyled/src/DateField.tsx	91.66% <0%> (-8.34%)	⬇️
packages/uniforms-bootstrap3/src/DateField.tsx	90.9% <0%> (-9.1%)	⬇️
packages/uniforms-bootstrap4/src/DateField.tsx	90.9% <0%> (-9.1%)	⬇️

---

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 7904e7f...6c0a2c6. Read the comment docs.