Merge asyncRetrySimple, asyncRetryCustom into retryIfFalse

BREAKING CHANGES

• Merge asyncRetrySimple, asyncRetryCustom into asyncRetryIfFalse by @Marketionist in #51
• Rename asyncRetryIfFalse to retryIfFalse by @Marketionist in #53
• Deprecate createRequest in favour of sendRequest and accept configuration object only by @Marketionist in #55

What's Changed

• Update tests for asyncRetryIfFalse by @Marketionist in #52
• Update tests for retryIfFalse by @Marketionist in #54
• Simplify retryIfFalse by @Marketionist in #56
• Add retry function to keywords and update wording by @Marketionist in #57

Full Changelog: v1.8.1...v2.0.0