Add .travis.yml

PG13 doesn't work yet: pgs_moc.h:11:31: fatal error: access/tuptoaster.h: No such file or directory

Author: df7cb

.travis.yml

@@ -0,0 +1,31 @@
+# run the testsuite on travis-ci.com
+---
+# versions to run on
+env:
+  - PG_SUPPORTED_VERSIONS=9.1
+  - PG_SUPPORTED_VERSIONS=9.2
+  - PG_SUPPORTED_VERSIONS=9.3
+  - PG_SUPPORTED_VERSIONS=9.4
+  - PG_SUPPORTED_VERSIONS=9.5
+  - PG_SUPPORTED_VERSIONS=9.6
+  - PG_SUPPORTED_VERSIONS=10
+  - PG_SUPPORTED_VERSIONS=11
+  - PG_SUPPORTED_VERSIONS=12
+  #- PG_SUPPORTED_VERSIONS=13
+
+language: C
+dist: xenial
+
+before_install:
+  # extra apt.pg.o.sh options added in version 204, travis currently has 199 (2019-11-27)
+  - sudo apt-get -qq update
+  - sudo apt-get -y install postgresql-common
+
+install:
+  - sudo /usr/share/postgresql-common/pgdg/apt.postgresql.org.sh -p -v $PG_SUPPORTED_VERSIONS -i
+
+script:
+  - make
+  - sudo make install
+  - pg_virtualenv make installcheck
+  - if test -s regression.diffs; then cat regression.diffs; fi