Compressed images without loss of quality

`----- Image optimization started -----

C:\Users\blowess\Documents\GitHub\acf\images\button_remove.png - using
http://smushit.com
Before: 1388 bytes
After: 380 bytes
Savings: 72.62%

C:\Users\blowess\Documents\GitHub\acf\images\button_add.png - using
http://smushit.com
Before: 1397 bytes
After: 412 bytes
Savings: 70.51%

C:\Users\blowess\Documents\GitHub\acf\images\add-ons\options-page-thumb.jpg
- using http://smushit.com
Before: 16201 bytes
After: 16091 bytes
Savings: 0.68%

C:\Users\blowess\Documents\GitHub\acf\images\add-ons\gallery-field-thumb.jpg
- using http://smushit.com
Before: 24886 bytes
After: 24111 bytes
Savings: 3.11%

C:\Users\blowess\Documents\GitHub\acf\images\sprite@2x.png - using
http://smushit.com
Before: 11936 bytes
After: 10379 bytes
Savings: 13.04%

C:\Users\blowess\Documents\GitHub\acf\images\add-ons\flexible-content-field-thumb.jpg
- using http://smushit.com
Before: 8488 bytes
After: 8347 bytes
Savings: 1.66%

C:\Users\blowess\Documents\GitHub\acf\images\sprite.png - using
http://smushit.com
Before: 5897 bytes
After: 4490 bytes
Savings: 23.86%

C:\Users\blowess\Documents\GitHub\acf\images\brand-hero-default.png -
using http://smushit.com
Before: 30850 bytes
After: 29119 bytes
Savings: 5.61%

C:\Users\blowess\Documents\GitHub\acf\images\add-ons\repeater-field-thumb.jpg
- using http://smushit.com
Before: 19336 bytes
After: 18899 bytes
Savings: 2.26%

0 skipped. 9 optimized. Total savings 6.77%`