Update pg requirement from >= 0.17, < 0.19 to >= 0.17, < 1.3

[dependabot-preview]

Updates the requirements on pg to permit the latest version.

Changelog

Sourced from pg's changelog.

== v1.2.3 [2020-03-18] Michael Granger [email protected]

Bugfixes:

• Fix possible segfault at PG::Coder#encode, decode or their implicit calls through a typemap after GC.compact. #327
• Fix possible segfault in PG::TypeMapByClass after GC.compact. #328

== v1.2.2 [2020-01-06] Michael Granger [email protected]

Enhancements:

• Add a binary gem for Ruby 2.7.

== v1.2.1 [2020-01-02] Michael Granger [email protected]

Enhancements:

• Added internal API for sequel_pg compatibility.

== v1.2.0 [2019-12-20] Michael Granger [email protected]

Repository:

• Our primary repository has been moved to Github https://github.com/ged/ruby-pg . Most of the issues from https://bitbucket.org/ged/ruby-pg have been migrated. #43

API enhancements:

• Add PG::Result#field_name_type= and siblings to allow symbols to be used as field names. #306
• Add new methods for error reporting:
  • PG::Connection#set_error_context_visibility
  • PG::Result#verbose_error_message
  • PG::Result#result_verbose_error_message (alias)
• Update errorcodes and error classes to PostgreSQL-12.0.
• New constants: PG_DIAG_SEVERITY_NONLOCALIZED, PQERRORS_SQLSTATE, PQSHOW_CONTEXT_NEVER, PQSHOW_CONTEXT_ERRORS, PQSHOW_CONTEXT_ALWAYS

Type cast enhancements:

• Add PG::TextEncoder::Record and PG::TextDecoder::Record for en/decoding of Composite Types. #258, #36
• Add PG::BasicTypeRegistry.register_coder to register instances instead of classes. This is useful to register parametrized en/decoders like PG::TextDecoder::Record .
• Add PG::BasicTypeMapForQueries#encode_array_as= to switch between various interpretations of ruby arrays.
• Add Time, Array, Array and Array encoders to PG::BasicTypeMapForQueries
• Exchange sprintf based float encoder by very fast own implementation with more natural format. #301
• Define encode and decode methods only in en/decoders that implement it, so that they can be queried by respond_to? .
• Improve PG::TypeMapByColumn#inspect
• Accept Integer and Float as input to TextEncoder::Numeric . #310

Other enhancements:

Commits

• 4101db6 Bump the patch version, update history
• e95de2f Run x86-mingw32 cross build only, to decrease test time
• 822bd91 Merge pull request #330 from amarshall/avoid-typemap-warn
• 6ac3de4 Avoid type cast warning in build_coder_maps
• a50f238 Update History for 1.2.3
• 7c1756f Fix possible segfaults after GC.compact
• 093741a Merge pull request #326 from semaperepelitsa/patch-1
• 2712bfb Fix small typo in Readme
• 60e50ce conn.socket works on Unix only
• 3f2612d conn.socket_io is compiled unconditionally now
• Additional commits viewable in compare view

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