Adds deprecation warning for usage of future non-default parsing extensions

[joelgallant]

#135

[cypress]

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Test summary

17 • 0 • 0 • 0

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Run details

Project	App Config
Status	Passed
Commit	e1318c6
Started	May 2, 2021 1:10 AM
Ended	May 2, 2021 1:13 AM
Duration	02:33 💡
OS	Linux Ubuntu - 20.04
Browser	Electron 87

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[codecov-commenter]

Codecov Report

Merging #150 (e1318c6) into master (1912747) will decrease coverage by 0.17%.
The diff coverage is 70.00%.

@@            Coverage Diff             @@
##           master     #150      +/-   ##
==========================================
- Coverage   80.51%   80.34%   -0.18%     
==========================================
  Files          42       42              
  Lines        2366     2391      +25     
  Branches      558      569      +11     
==========================================
+ Hits         1905     1921      +16     
- Misses        461      470       +9     

Impacted Files	Coverage Δ
app-config-v1-compat/src/index.ts	51.02% <22.22%> (-8.08%)	⬇️
app-config-git/src/index.ts	62.50% <75.00%> (-1.39%)	⬇️
app-config-encryption/src/index.ts	93.75% <80.00%> (-6.25%)	⬇️
app-config-extensions/src/substitute-directive.ts	97.80% <100.00%> (+0.33%)	⬆️

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