package.json: Use the name enjoyreading instead of enjoy-reading.

This is more in line with what the previous author (jblanche) adopted.  I am
thinking about changing the name of the extention, anyway.

Signed-off-by: Rogério Brito <rbrito@ime.usp.br>
package.json: Set a very low initial version.

This will allow us to change things frequently.

Signed-off-by: Rogério Brito <rbrito@ime.usp.br>