Add a Travis CI test for FWRETRACT

.travis.yml

@@ -76,7 +76,8 @@ script:
   - build_marlin
   #
   # Test 2 extruders (one MAX6675) and heated bed on basic RAMPS 1.4
-  #  plus a "Fix Mounted" Probe with Safe Homing and some arc options
+  # Test a "Fix Mounted" Probe with Safe Homing, some arc options,
+  # linear bed leveling, M48, leveling debug, and firmware retraction.
   #
   - opt_set MOTHERBOARD BOARD_RAMPS_14_EEB
   - opt_set EXTRUDERS 2
@@ -84,12 +85,10 @@ script:
   - opt_set TEMP_SENSOR_1 1
   - opt_set TEMP_SENSOR_BED 1
   - opt_enable PIDTEMPBED FIX_MOUNTED_PROBE Z_SAFE_HOMING ARC_P_CIRCLES CNC_WORKSPACE_PLANES
+  - opt_enable REPRAP_DISCOUNT_SMART_CONTROLLER SDSUPPORT EEPROM_SETTINGS
   - opt_enable BLINKM PCA9632 RGB_LED NEOPIXEL_RGBW_LED
-  - build_marlin
-  #
-  # ...with AUTO_BED_LEVELING_LINEAR, Z_MIN_PROBE_REPEATABILITY_TEST, and DEBUG_LEVELING_FEATURE
-  #
   - opt_enable AUTO_BED_LEVELING_LINEAR Z_MIN_PROBE_REPEATABILITY_TEST DEBUG_LEVELING_FEATURE
+  - opt_enable_adv FWRETRACT
   - opt_set ABL_GRID_POINTS_X 16
   - opt_set ABL_GRID_POINTS_Y 16
   - build_marlin