Fix a breaking change of construct 2.9.23

[syssi]

Parameter "context" of the parse method was replaced by **kw.

[coveralls]

Coverage increased (+0.02%) to 66.963% when pulling 9368d8b on syssi:feature/fix-fox-construct-2.9.23 into b0c04cf on rytilahti:master.

[coveralls]

Coverage increased (+0.02%) to 66.963% when pulling 9368d8b on syssi:feature/fix-fox-construct-2.9.23 into b0c04cf on rytilahti:master.

[coveralls]

Coverage increased (+0.02%) to 66.963% when pulling 9368d8b on syssi:feature/fix-fox-construct-2.9.23 into b0c04cf on rytilahti:master.

[yawor]

Maybe we really should pin the Construct to specific version in setup.py, and monitor for new versions from time to time. That way the released versions of the library won't break because of some backward incompatible change in the dependency.

Also you could just change ctx to **ctx :). But this is also fine.