release-1.4: little typo

release builds was disabled

release-1.4: little typo

Merge branch 'develop'

Merge remote-tracking branch 'origin/master'

release-1.4: Changelogs were updated

#22 unit-test was fixed

#22 Type of ZigZagFilter() was changed to Pandas Dataframe instead of dict

release-1.4: CI was updated

release-1.4: documentation was updated

add release branches

#24 Long-series example with more realistic volumes was added

debug builds was disabled

#25 start volumes near middle-line

#24 #25 run dev-build