v1.3.4

Format v1.3.4

Diff since v1.3.3

Fix precision for Python style string formatting

Merged pull requests:

• Add support for _ and , separators for Python formats (#68) (@ScottPJones)
• Fix InexactError issue #102 (#69) (@ScottPJones)
• Fix issue #83 (from Formatting.jl), handle precision argument for Pyt… (#70) (@ScottPJones)