Merge pull request #3430 from leptun/MK3_MK2_obsolete

Make the MK2 variants obsolete in the MK3 branch

.travis.yml

@@ -28,8 +28,3 @@ script:
   - cp Firmware/variants/1_75mm_MK25-RAMBo10a-E3Dv6full.h Firmware/Configuration_prusa.h
   - bash -x build.sh || { echo "1_75mm_MK25-RAMBo10a-E3Dv6full variant failed" && false; }
   - rm Firmware/Configuration_prusa.h
-  - cp Firmware/variants/1_75mm_MK2-RAMBo13a-E3Dv6full.h Firmware/Configuration_prusa.h
-  - bash -x build.sh || { echo "1_75mm_MK2-RAMBo13a-E3Dv6full variant failed" && false; }
-  - rm Firmware/Configuration_prusa.h
-  - cp Firmware/variants/1_75mm_MK2-RAMBo10a-E3Dv6full.h Firmware/Configuration_prusa.h
-  - bash -x build.sh || { echo "1_75mm_MK2-RAMBo10a-E3Dv6full variant failed" && false; }