Changed the script multi line chracter

.travis.yml

@@ -8,11 +8,11 @@ script:
   - docker run --rm -v $PWD/code:/project -w /project espressif/idf:release-v4.0 idf.py build
   - docker run --rm -v $PWD/pcb-design:/project -w /project registry.gitlab.com/dowster/eeshow:latest eeplot -o pcb-design-${TRAVIS_TAG}-${TRAVIS_BUILD_NUMBER}.pdf schematic.pro
 before_deploy:
- - |
-   tar -zcf e28-cluster-${TRAVIS_TAG}-${TRAVIS_BUILD_NUMBER}.tar.gz \\
-   code/build/partition_table/partition-table.bin \\
-   code/build/bootloader/bootloader.bin \\
-   code/build/e28-cluster.bin \\
+ - >-
+   tar -cvzf e28-cluster-${TRAVIS_TAG}-${TRAVIS_BUILD_NUMBER}.tar.gz 
+   code/build/partition_table/partition-table.bin 
+   code/build/bootloader/bootloader.bin 
+   code/build/e28-cluster.bin 
    pcb-design/pcb-design-${TRAVIS_TAG}-${TRAVIS_BUILD_NUMBER}.pdf
 
 deploy: