Travis: roll-back Composer to v 1.10.10

... as there is an issue with Composer 1.10.11, which prevents the `install` from working. For more information: composer/composer#9191
WordPress · Sep 8, 2020 · ffa0ae6 · ffa0ae6
1 parent dcd3525
commit ffa0ae6
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/.travis.yml b/.travis.yml
@@ -163,6 +163,9 @@ before_install:
     - export XMLLINT_INDENT="	"
 
 install:
+    # Temporary: Composer 1.10.11 has a bug which breaks our install.
+    # https://github.com/composer/composer/issues/9191
+    - composer.phar self-update 1.10.10
     - |
       if [[ ${PHPCS_BRANCH:0:2} == "4." ]]; then
         # Set Composer up to download only PHPCS from source for PHPCS 4.x.