v0.29.3

Fixed issue #222.

v0.29.2

Updated version. [skip CI]

v0.29.0

Updated docs. [skip CI]

v0.28.3

Added `-` for implicit object.

v0.28.2

Allowed backcall without parentheses.

v0.27.5

Fix build.

v0.27.4

Fixing issue #206.

v0.27.3

Fixed spec.

v0.27.2

Added more test cases.

v0.27.1

Fixed issue #194, #195.