Changelog
0973182 [docker] use go modules
92ba2b1 [travis] enable module-based builds
6ce0043 Update copyright year to 2019
724c751 Migrate to Go modules
264c12d Support output in CSV format
07cb13e Accept null for pg_available_extensions.comment, fixes #21
d4f46ce Handle case when pg_get_expr returns null, fixes #20
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