Fix for race-condition with once

• chore: pin to fix-branch on react-is-visible c6dfb36
• docs: fix docs error 0fb609a
• docs: update example docs 917be2e

v0.2.0...v0.2.1-0

Add `once`

chore(release): 0.2.0 [skip ci]

# [0.2.0](https://github.com/lessp/bs-react-is-visible/compare/v0.1.3...v0.2.0) (2019-10-04)

### Features

* add trigger once option ([#2](https://github.com/lessp/bs-react-is-visible/issues/2)) ([245283b](https://github.com/lessp/bs-react-is-visible/commit/245283b))

0.1.3 - Minor cleanup

• chore: entries are actually Js.t ca969e0
• chore(deps): bump lodash from 4.17.11 to 4.17.14 (#1) 0731ee7
• docs(readme): fix typo 8a60071
• docs: update example 469a860
• docs: minor correction to lazyload-example 3c35129

v0.1.2...v0.1.3

v0.1.2

• docs: add link to examples fee9b44
• docs: lets just skip routing for now.. 5844744
• docs: hopefully fixes router-issue with gh-pages 47bcf66
• docs: hopefully fixes github-pages issue 08150ba

v0.1.1...v0.1.2

v0.1.1

• chore: add prepare-script 0735866
• docs: add built examples f00fb71
• fix: dependency configuration 9df88ff
• docs: update examples 5f68cba
• chore: dependency-configuration 37cb81e
• docs: update README with link to react-is-visible d82e596
• docs: update README with IO compatibility chart 0bb41c2
• refactor: extract callback to a separate function 41c4181
• chore: config-files 74f5d74
• chore: update package-lock ef2b25b
• chore: add MIT-license 7f2df6a
• docs: update README with polyfill-instructions fa5150d
• test: add tests dec8017
• refactor: now removes element from subscribers on unmount 5d2af3f
• chore: remove webpack from dependencies e2cf85e
• chore: use parcel add example b9d3032
• chore: remove .swp-files f86185c
• docs: add syntax-highlighting to README f71342e

0b121fe...v0.1.1