Continue testing unsupported versions

They are no longer supported by their vendors, but until we do support
them, we should continue testing them.

.scrutinizer.yml

@@ -21,7 +21,7 @@ before_commands:
 tools:
     external_code_coverage:
         timeout: 3600
-        runs: 24 # 19x Travis (jobs with COVERAGE=yes) + 3x AppVeyor (jobs with coverage=yes) + 2x ContinuousPHP
+        runs: 28 # 23x Travis (jobs with COVERAGE=yes) + 3x AppVeyor (jobs with coverage=yes) + 2x ContinuousPHP
 
 filter:
     excluded_paths:

.travis.yml

@@ -104,6 +104,9 @@ jobs:
     - stage: Test
       php: 7.3
       env: DB=mysqli.docker IMAGE=mysql:8.0 COVERAGE=yes
+    - stage: Test
+      php: 7.3
+      env: DB=mariadb.docker IMAGE=mariadb:10.0 COVERAGE=yes
     - stage: Test
       php: 7.3
       env: DB=mariadb.docker IMAGE=mariadb:10.1 COVERAGE=yes
@@ -113,6 +116,9 @@ jobs:
     - stage: Test
       php: 7.3
       env: DB=mariadb.docker IMAGE=mariadb:10.3 COVERAGE=yes
+    - stage: Test
+      php: 7.3
+      env: DB=mariadb.mysqli.docker IMAGE=mariadb:10.0 COVERAGE=yes
     - stage: Test
       php: 7.3
       env: DB=mariadb.mysqli.docker IMAGE=mariadb:10.1 COVERAGE=yes
@@ -122,6 +128,22 @@ jobs:
     - stage: Test
       php: 7.3
       env: DB=mariadb.mysqli.docker IMAGE=mariadb:10.3 COVERAGE=yes
+    - stage: Test
+      dist: trusty
+      php: 7.3
+      env: DB=pgsql POSTGRESQL_VERSION=9.2 COVERAGE=yes
+      services:
+        - postgresql
+      addons:
+        postgresql: "9.2"
+    - stage: Test
+      dist: trusty
+      php: 7.3
+      env: DB=pgsql POSTGRESQL_VERSION=9.3 COVERAGE=yes
+      services:
+        - postgresql
+      addons:
+        postgresql: "9.3"
     - stage: Test
       php: 7.3
       env: DB=pgsql POSTGRESQL_VERSION=9.4 COVERAGE=yes