Mice.jl v0.1.1

Major changes:

• Corrected calculation of p-values in pool() (now using two-tailed instead of one-tailed tests) and
• Added three new imputation methods - mean, norm and sample.

What's Changed

• Adding methods mean, norm and sample by @tom-metherell in #15

Full Changelog: v0.1.0...v0.1.1