Update ruby-thor to 1.0.1.
# 1.0.1
* Fix thor when `thor/base` and `thor/group` are required without `thor.rb`.
* Handle relative source path in `create_link`.
# 1.0.0
* Drop support to Ruby 1.8 and 1.9.
* Deprecate relying on default `exit_on_failure?`.
In preparation to make Thor commands exit when there is a failure we are deprecating
defining a command without defining what behavior is expected when there is a failure.
To fix the deprecation you need to define a class method called `exit_on_failure?` returning
`false` if you want the current behavior or `true` if you want the new behavior.
* Deprecate defining an option with the default value using a different type as defined in the option.
* Allow options to be repeatable. See #674.
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