Fix #309: Not to include `\0` in the resulted token by `scanBlockScalar`

[tom-tan]

This request fixes #309 by changing scanBlockScalar not to include \0 in the resulted token. I also added a unittest for it.

[codecov[bot]]

Codecov Report

Merging #310 (7939f44) into master (acba077) will increase coverage by 0.00%. The diff coverage is 100.00%.

Additional details and impacted files

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[Herringway]

Simple and tested, just the way I like it. Thanks!