Changed everything to esm and updated to pkg.json to module

[joawan]

Tested with https://github.com/schibsted/sdk-example

• Go to this branch, run npm link
• Download sdk example, run npm link @schibsted/account-sdk-browser
• Create the .env file in sdk-example (add a bogus client_id, client_secret and sessionDomain)
• Run npm run dev in sdk-example
• See how build works and the localhost:9000

[codecov]

Codecov Report

Merging #251 (55604c6) into master (3b14a28) will decrease coverage by 0.01%.
The diff coverage is n/a.

❗ Current head 55604c6 differs from pull request most recent head 3a3a4d5. Consider uploading reports for the commit 3a3a4d5 to get more accurate results

@@            Coverage Diff             @@
##           master     #251      +/-   ##
==========================================
- Coverage   99.79%   99.78%   -0.01%     
==========================================
  Files          13       13              
  Lines         478      476       -2     
  Branches       96       96              
==========================================
- Hits          477      475       -2     
  Misses          1        1              

Files	Coverage Δ
src/identity.js	99.51% <ø> (-0.01%)	⬇️
src/monetization.js	100.00% <ø> (ø)

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[ole-martin]

Looks good to me, should be backwards compatible, altho it's hard to say 100% sure. Minor version bump would probably be OK.

[bogdan-niculescu-sch]

LGTM 🚀