Update to 0.13 for breaking serde update

Author: mitchmindtree

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "time_calc"
 description = "A library for music/DSP time conversions! Provides functions and methods for converting between ticks, ms, samples, bars, beats and measures."
-version = "0.12.1"
+version = "0.13.0"
 authors = ["[email protected]"]
 readme = "README.md"
 keywords = ["time", "dsp", "audio", "music", "conversion"]