Upgrade packages to latest version

[mesaugat]

• Remove test:watch and test npm run commands (They were not working after the upgrade + rename test:coverage to test)
• Remove node 8 from travis configuration as it is no longer supported
• The upgrade fixes all the vulnerability in packages
• Upgraded packages for all examples (all of the servers seem to work fine)

[codecov-io]

Codecov Report

Merging #74 (cc19f01) into master (abdaf28) will increase coverage by 96.29%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master      #74       +/-   ##
===========================================
+ Coverage        0   96.29%   +96.29%     
===========================================
  Files           0        5        +5     
  Lines           0      135      +135     
  Branches        0       24       +24     
===========================================
+ Hits            0      130      +130     
- Misses          0        2        +2     
- Partials        0        3        +3     

Impacted Files	Coverage Δ
src/impl/domain.ts	97.43% <100.00%> (ø)
src/constants.ts	100.00% <0.00%> (ø)
src/AsyncStoreAdapter.ts	100.00% <0.00%> (ø)
src/index.ts	94.00% <0.00%> (ø)
src/StoreDomain.ts	100.00% <0.00%> (ø)

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[codecov-io]

Codecov Report

Merging #74 (82b31b0) into master (abdaf28) will increase coverage by 96.29%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master      #74       +/-   ##
===========================================
+ Coverage        0   96.29%   +96.29%     
===========================================
  Files           0        5        +5     
  Lines           0      135      +135     
  Branches        0       24       +24     
===========================================
+ Hits            0      130      +130     
- Misses          0        2        +2     
- Partials        0        3        +3     

Impacted Files	Coverage Δ
src/impl/domain.ts	97.43% <100.00%> (ø)
src/StoreDomain.ts	100.00% <0.00%> (ø)
src/index.ts	94.00% <0.00%> (ø)
src/constants.ts	100.00% <0.00%> (ø)
src/AsyncStoreAdapter.ts	100.00% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update abdaf28...82b31b0. Read the comment docs.