Read the task's name and uses as default

[guifeliper]

Read the task's name and uses as default, so the user can read the previous task's name.
This commit is an answer to the issue #245.

Fixes #245

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[inkarkat]

At least in my Bash 4.3.48(1)-release, the variable (input) needs to come last:

-bash: read: `-r': not a valid identifier

[guifeliper]

@inkarkat you seem to be right, my local version is
GNU bash, version 3.2.57(1)-release (x86_64-apple-darwin16)

The version of GNU bash, version 4.4.5(1)-release has the same behaviour you mentioned above.
I suggest we use
read -r -i $todo -e input

[karbassi]

@inkarkat thoughts on this merge? Is it good to go with @guifeliper's updates?