Merge bitcoin#18441: ci: Remove misplaced comments from folded block scalar

e41e46c ci: Remove misplaced comments from folded block scalar (Hennadii Stepanov)

Pull request description:

  On master (f3a91ab) the [build log for ARM](https://travis-ci.org/github/bitcoin/bitcoin/jobs/667247758) contains:
  ```
  $ export FILE_ENV="./ci/test/00_setup_env_arm.sh"
  $ export QEMU_USER_CMD=""
  $ export Can=
  $ export run=
  $ export the=
  $ export tests=
  $ export natively=
  $ export without=
  $ export qemu=

  Setting up build cache
  ...
  ```
  and
  ![Screenshot from 2020-03-26 18-58-50](https://user-images.githubusercontent.com/32963518/77674223-e28d2d00-6f93-11ea-82a1-7f805ccb678d.png)

  With this PR:
  ```
  $ export FILE_ENV="./ci/test/00_setup_env_arm.sh"
  $ export QEMU_USER_CMD=""

  Setting up build cache
  ...
  ```

  and
  ![Screenshot from 2020-03-26 19-01-56](https://user-images.githubusercontent.com/32963518/77674456-4d3e6880-6f94-11ea-9c83-546c81f1cdf7.png)

  ---

  Also Travis [build config validation](https://docs.travis-ci.com/user/build-config-validation) added:
  ![Screenshot from 2020-03-26 19-04-19](https://user-images.githubusercontent.com/32963518/77674686-9ee6f300-6f94-11ea-900f-fdef8a673113.png)

Top commit has no ACKs.

Tree-SHA512: a3ea05d543a4d46c65fffd7c67df9bbd4ca8d426fa215c5ce26653de34145edd419a54884da0416608a2c90bf5b421cab3ec32290c8916f10399354b44ddeb99

Author: MarcoFalke

.travis.yml

@@ -25,6 +25,8 @@
 # [1] https://docs.travis-ci.com/user/caching/#build-phases
 # [2] https://docs.travis-ci.com/user/customizing-the-build#build-timeouts
 
+version: ~> 1.0
+
 dist: xenial
 os: linux
 language: minimal
@@ -84,19 +86,19 @@ jobs:
 
     - stage: test
       name: 'ARM  [GOAL: install]  [buster]  [unit tests, functional tests]'
-      arch: arm64
+      arch: arm64  # Can disable QEMU_USER_CMD and run the tests natively without qemu
       env: >-
         FILE_ENV="./ci/test/00_setup_env_arm.sh"
-        QEMU_USER_CMD=""  # Can run the tests natively without qemu
+        QEMU_USER_CMD=""
 
 # s390 build was disabled temporarily because of disk space issues on the Travis VM
 #
 #    - stage: test
 #      name: 'S390x  [GOAL: install]  [buster]  [unit tests, functional tests]'
-#      arch: s390x
+#      arch: s390x  # Can disable QEMU_USER_CMD and run the tests natively without qemu
 #      env: >-
 #        FILE_ENV="./ci/test/00_setup_env_s390x.sh"
-#        QEMU_USER_CMD=""  # Can run the tests natively without qemu
+#        QEMU_USER_CMD=""
 
     - stage: test
       name: 'Win64  [GOAL: deploy]  [unit tests, no gui, no functional tests]'