travis-ci: enable PHP 7.2 in testing

Previous changes enable support of phpunit-8 and eliminate its
deprecation warnings. Now we ready to enable PHP 7.2 testing using the
maximal phpunit version, which supports it: it is phpunit-8.

The commit enables testing of PHP 7.2 in Travis CI and in the script for
local testing (test.all.sh).

Author: Totktonada

.travis.yml

@@ -45,6 +45,20 @@ jobs:
     - php: 7.1
       env: TARANTOOL_VERSION=2.4
 
+    # PHP 7.2
+    # -------
+    - php: 7.2
+      env: TARANTOOL_VERSION=1.9
+    - php: 7.2
+      env: TARANTOOL_VERSION=1.10
+    - php: 7.2
+      env: TARANTOOL_VERSION=2.1
+    # - php: 7.2
+    #   env: TARANTOOL_VERSION=2.2
+    - php: 7.2
+      env: TARANTOOL_VERSION=2.3
+    - php: 7.2
+      env: TARANTOOL_VERSION=2.4
 
 python:
   - 2.7

test.all.sh

@@ -2,7 +2,7 @@
 
 set -exu  # Strict shell (w/o -o pipefail)
 
-php_version_list="7.0 7.1"
+php_version_list="7.0 7.1 7.2"
 tarantool_version_list="1.6 1.7 1.9 1.10 2.1 2.2 2.3 2.4"
 
 # gh-151: disable tarantool-2.2 due to lack of support the new