How to hide app store updates in macOS Sierra?
To hide an update:


Open the Mac App Store and click the Updates tab.
Right click on the update(s) that you wish to hide, and click Hide Update.


Example:



To unhide an update:


Open the Mac App Store
Click the Store tab in the menu bar and select Show All Software Updates.


Example:



Why there could have been no option:


  Right-Click "Hide update" worked in Sierra through 10.12.4. Some time in the last couple of updates it stopped being an option. However: Updates you previously "hid" (in an earlier version of Sierra) are still flagged as "hidden" and still stay out of sight, you just cant add any new items to hide.