feat: add flow type definitions

[alebiavati]

Status

READY

Description

• update dependencies to latest version, including ca-ui-themer to get changes merged from Add flow notations themer#29.
• pin react and react-dom devDependencies to v15.4.1 because v15.5.x breaks the test suite.
• add flow type definitions to react-themer Higher Order Component using react-flow-types
• fix flow type definitions for ThemeProvider component

[codecov-io]

Codecov Report

Merging #44 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #44   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           4      4           
  Lines          30     36    +6     
  Branches       10     10           
=====================================
+ Hits           30     36    +6

Impacted Files	Coverage Δ
src/theme-provider/index.js	100% <ø> (ø)	⬆️
src/react-themer/index.js	100% <100%> (ø)	⬆️

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