Release 0.6.3

The release v0.6.3 is mostly about improving maintenance.

New functions

• waveform_features module
  • Waveform signal-to-noise ratio (#219).
• Added support for Butterworth sosfiltfilt - numerically stable (in particular, higher order) filtering (#234).

Buf fixes

• Fixed neo version typo in requirements file (#218)
• Fixed broken docs (#230, #232)
• Fixed issue with 32-bit arch (#229)

Other changes

• Added issue templates (#226)
• Single VERSION file (#231)