CS2113-AY1819S2-T09-1 / main / 661

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travis-ci

Logic/command: update `HistoryCommand#execute(...)` & error message (#141)

Let's update `HistoryCommand#MESSAGE_NO_HISTORY` to sound more natural,
and update `HistoryCommand#execute(...)` to print the command history in
an unordered list format.

Example:
- undo    [last command executed]
- redo    [second last command executed]

7 of 7 new or added lines in 1 file covered. (100.0%)

2237 of 2580 relevant lines covered (86.71%)

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