add perl 5.32 testing on Travis

.travis.yml

@@ -1,23 +1,39 @@
 language: perl
-dist: trusty
-env: PERL_USE_UNSAFE_INC=0
-perl:
-  - "5.8"
-  - "5.10"
-  - "5.12"
-  - "5.14"
-  - "5.16"
-  - "5.18"
-  - "5.20"
-  - "5.22"
-  - "5.24"
-  - "5.26"
-  - "5.28"
-  - "5.30"
 matrix:
   include:
+    - perl: 5.8
+      dist: trusty
+    - perl: 5.10
+      dist: trusty
+    - perl: 5.12
+      dist: trusty
+    - perl: 5.14
+      dist: trusty
+    - perl: 5.16
+      dist: trusty
+    - perl: 5.18
+      dist: trusty
+    - perl: 5.20
+      dist: trusty
+    - perl: 5.22
+      dist: trusty
+    - perl: 5.24
+      dist: trusty
+    - perl: 5.26
+      env: PERL_USE_UNSAFE_INC=0
+      dist: trusty
+    - perl: 5.28
+      env: PERL_USE_UNSAFE_INC=0
+      dist: trusty
+    - perl: 5.30
+      env: PERL_USE_UNSAFE_INC=0
+      dist: trusty
+    - perl: 5.32
+      env: PERL_USE_UNSAFE_INC=0
+      dist: xenial
     - perl: 5.20
       env: COVERAGE=1
+      dist: trusty
 before_install:
   - eval $(curl https://travis-perl.github.io/init) --auto
 sudo: false