Added new option for clipboard input

Signed-off-by: gwendoux <gwenael.doux@cncc.fr>
prompt help when filename is undefined

Signed-off-by: gwendoux <gwenael.doux@cncc.fr>
Added option to use clipboard

Signed-off-by: gwendoux <gwenael.doux@cncc.fr>
copy output content in the clipboard

Signed-off-by: gwendoux <gwenael.doux@cncc.fr>
Merge branch 'master' into feat-clipboard

Signed-off-by: gwendoux <gwenael.doux@cncc.fr>

Conflicts:
	README.md
	index.js
	package.json
updated usage part

Signed-off-by: gwendoux <gwenael.doux@cncc.fr>
Merge branch 'feat-clipboard'
version v0.1.0

Signed-off-by: gwendoux <gwenael.doux@cncc.fr>