require diagrams-svg >= 0.8.0.1 (0.8 is broken)
bump version to 0.2.1
CHANGES for 0.2
Reverting "add -j flag (currently does nothing)"
Revert "add -j flag (currently does nothing)"

This reverts commit bfc95056f3a0f259352068d0ad37a9e3f2294eec.

Parallel builds don't seem to be working out (see #19) so revert for now.
CHANGES for 0.2.1