Merge pull request prusa3d#3355 from 3d-gussner/MK3_Travis_focal

Change Travis to Ubuntu 20.04 LTS (focal)

Author: DRracer

.travis.yml

@@ -1,4 +1,4 @@
-dist: trusty
+dist: focal
 before_install:
   - sudo apt-get install -y ninja-build
   # Arduino IDE adds a lot of noise caused by network traffic, trying to firewall it off
@@ -32,4 +32,4 @@ script:
   - 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; }
+  - bash -x build.sh || { echo "1_75mm_MK2-RAMBo10a-E3Dv6full variant failed" && false; }

PF-build.sh

@@ -166,6 +166,7 @@
 # 24 Jun 2021, 3d-gussner, Fix MK404 user interaction not to show if compiling 'All' variants
 # 24 Jun 2021, 3d-gussner, MK404 is only supported on Linux at this moment.
 
+
 SCRIPT_PATH="$( cd "$(dirname "$0")" ; pwd -P )"
 
 #### Start: Failures