Export default loaders object

[chrisblossom]

This updates #208 to export the actual defaultLoaders object used by cosmiconfig.

Note: it currently is based on #211. If that doesn't land and this PR is wanted, I'll update accordingly.

[codecov-io]

Codecov Report

Merging #212 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #212   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           7      9    +2     
  Lines         228    220    -8     
  Branches       51     43    -8     
=====================================
- Hits          228    220    -8

Impacted Files	Coverage Δ
src/createExplorer.ts	100% <100%> (ø)	⬆️
src/index.ts	100% <100%> (ø)	⬆️
src/loaders.ts	100% <100%> (ø)	⬆️
src/createExplorerBase.ts	100% <100%> (ø)
src/createExplorerSync.ts	100% <100%> (ø)

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