Small change to contributing.md

[schmikei]

Description of Changes

We now require two approvers per merge of PR

Please check that the PR fulfills these requirements

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• Add a changelog entry (for non-trivial bug fixes / features)
• CI passes

[codecov]

Codecov Report

Merging #562 (61fc2ee) into master (3b23e5c) will decrease coverage by 1.97%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #562      +/-   ##
==========================================
- Coverage   76.69%   74.72%   -1.97%     
==========================================
  Files         132      132              
  Lines        8308    10000    +1692     
==========================================
+ Hits         6371     7472    +1101     
- Misses       1473     2064     +591     
  Partials      464      464              

Impacted Files	Coverage Δ
version/version.go	25.00% <0.00%> (-8.33%)	⬇️
cmd/stanza/graph.go	47.22% <0.00%> (-7.62%)	⬇️
...builtin/input/aws/cloudwatch/cloudwatch_persist.go	75.00% <0.00%> (-6.82%)	⬇️
operator/buffer/disk_metadata.go	35.71% <0.00%> (-6.59%)	⬇️
...tor/builtin/transformer/restructure/restructure.go	70.17% <0.00%> (-6.50%)	⬇️
operator/helper/persister.go	70.59% <0.00%> (-6.16%)	⬇️
operator/builtin/transformer/metadata/metadata.go	60.53% <0.00%> (-6.14%)	⬇️
operator/builtin/input/file/file.go	74.90% <0.00%> (-5.82%)	⬇️
operator/builtin/input/file/reader.go	53.05% <0.00%> (-5.73%)	⬇️
operator/helper/input.go	68.75% <0.00%> (-5.61%)	⬇️
... and 118 more

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[BinaryFissionGames]

I think we'll also need to take a closer look at a couple more of these docs, particularly the maintainer stuff.