Fix README typos
Fix README typos

Signed-off-by: Benjamin Cabé <fe09bc2ef2737a3258f978e26226dcbac1b3f948@eclipse.org>

eclipse/packagedrone,ibh-systems/packagedrone,eclipse/packagedrone,ibh-systems/packagedrone,eclipse/packagedrone,ibh-systems/packagedrone,eclipse/packagedrone,mschreiber/packagedrone,mschreiber/packagedrone,ibh-systems/packagedrone,mschreiber/packagedrone,mschreiber/packagedrone