Basic coments... Probably is cable stretch as stated but could be a limiting screw moved.... So now that you mucked it up how to get it right again? Here are the steps...

0) Disconnect cable...
1) Put chain on smallest chain-ring and largest cog... Lowest gear
2) Adust the LOW STOP on the front D until the inside plate touches the chain... Then back off until it just clears.
3) Make sure front left shifter is in lowest postion (STI press little lever multiple times to make sure
4) Pull out all of the slack from the cable that you can, place it into the binder of the front D and tighten the cable binder bolt (be sure you place the cable through the binder the correct way!

Now the cable should be tight and the bottom adjustment should be right. Now to check the top adjustment...

1) Shift rear to smallest cog.
2) Try to shift into front biggest chain ring.
3) adjust HIGH adjustment until it touches chain on the outside of the front D shift plate. Then back off unitl it does not touch.

If you try and cannot get the thing to shift into the big ring then look to see when you press the shift lever does the front D hit the HIGH adjustment stop... if so LOOSEN the HIGH stop until you can... then go back to #3.

Note... Now if your bike and cranks are stiff enough you won't need to tweek anymore... You may find that to prevent some rubbing under heavy craking you will need to change the stops (move them out a 1/4 turn at most).