Synchronous mode as an add-on

[futpib]

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

Fixes #163

[codecov-io]

Codecov Report

Merging #164 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #164   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           4      7    +3     
  Lines         144    181   +37     
  Branches       42     53   +11     
=====================================
+ Hits          144    181   +37

Impacted Files	Coverage Δ
src/UniversalRouter.js	100% <ø> (ø)	:arrow_up:
src/UniversalRouterSync.js	100% <100%> (ø)
src/isChildRoute.js	100% <100%> (ø)
src/resolveRoute.js	100% <100%> (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 d5e32ce...9c36477. Read the comment docs.