📝 Recommend to use matching versions

[bcaudan]

Motivation

Following #611, improve documentation.

Changes

• add warning close to xhr shared data structure
• add note on npm setup to recommend using matching versions

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I have gone over the contributing documentation.

[sarina-dd]

Small edits

[codecov-io]

Codecov Report

Merging #615 (a79a53b) into master (b4b57c4) will increase coverage by 0.31%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #615      +/-   ##
==========================================
+ Coverage   88.81%   89.13%   +0.31%     
==========================================
  Files          54       54              
  Lines        2503     2503              
  Branches      541      541              
==========================================
+ Hits         2223     2231       +8     
+ Misses        280      272       -8     

Impacted Files	Coverage Δ
packages/core/src/browser/xhrProxy.ts	100.00% <ø> (ø)
...ckages/core/src/domain/automaticErrorCollection.ts	100.00% <0.00%> (+1.58%)	⬆️
packages/rum/src/browser/performanceCollection.ts	65.71% <0.00%> (+2.85%)	⬆️
packages/rum/src/transport/batch.ts	80.48% <0.00%> (+12.19%)	⬆️

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