v0.34.0 Runtime evaluation of string substitution and A/B Testing.

What's Changed

• feat: Differentiate between immediate evaluation at load time and deferred evaluation when getting the configuration. #226 by @credmond-git in #227
• feat: A/B Testing: Use a comma-separated list, where each element is a colon-separated pair of a threshold and its corresponding value. If an element has no threshold, it is treated as the default. For example, the format "10:red,30:green,blue" defines ranges and outcomes for random distributions: numbers from 1 to 10 correspond to red, 11 to 30 correspond to green, and all numbers above 30 default to blue. #219

Full Changelog: v0.33.1...v0.34.0