Upgrade pg to version 1.0.0

[depfu]

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We've upgraded a dependency and here is what you need to know:

name	version specification	new version
pg	~> 0.21	1.0.0

Please take a good look at the info here and the test results before merging this pull request.

What changed?

✳️ pg ( → 1.0.0) · Repo · Changelog

Commits

See the full diff on Github. The new version differs by 53 commits:

• Added signature for changeset fef434914848
• Bump major version and update History
• Remove deprecated constants in preparation for 1.0 release.
• Replace old expired gem-signing key with my current one
• Remove rbx-3 from travis-ci, because we don't aim to support it any longer
• Remove partial compatibility with Rubinius and MRI < 2.0
• Change PGconn -> PG::Connection in result_spec.rb
• Fix build on Windows with PostgreSQL < 10
• Remove compatibility code for Ruby < 1.9.3
• Remove support for PostgreSQL versions prior 9.2
• Implement wrapper for PQencryptPasswordConn()
• set_client_encoding: Use error message provided by libpq
• Merge branch 'master' of github.com:ged/ruby-pg
• Add ruby-2.5 to Windows binary gems
• Update History.md
• Support ruby-2.5 by Windows binary gems
• Update gemspec due to added/removed files
• Appveyor: Add ruby-head to test matrix
• Fix failing PostgreSQL install on travis-ci
• Better documentation to coder param of copy related methods
• Fix typos in documentation: form -> from
• Merge pull request #18 from junaruga/feature/specify-test-directory
• Specify test directory by environment variable.
• Merged in junaruga/ruby-pg/feature/travis-improve-layout (pull request #26)
• Update cross build dependencies to PostgreSQL-10.1 and OpenSSL-1.1.0g
• Update error codes per 'rake update_error_codes'
• Remove superfluous cross ruby version statements
• Merged in junaruga/ruby-pg/feature/add-ruby-2.5 (pull request #25)
• Add Ruby 2.5, and add ruby-head as allow_failure.
• Reword error text for PQsetClientEncoding()
• MINGW: Workaround segfault due to gcc linker error
• Avvpeyor: Re-add mercurial to PATH to fix bitbucket build
• Appveyor: Fix Tests
• Adjust tests for PostgreSQL-10
• Update travis ruby and PostgreSQL versions
• Update Appveyor ruby versions and fix tests for ruby-2.4
• Link OpenSSL-1.1.0 libs static into Windows binary gems, as it was with OpenSSL-1.0.2
• Update ruby and PostgreSQL versions on appveyor.
• Update History.rdoc regarding #256 [ci skip]
• Merge branch 'jjoos-master'
• Merge branch 'master' of git://github.com/jjoos/ruby-pg into jjoos-master
• Merge branch 'alyssais-patch-1'
• Merge branch 'patch-1' of git://github.com/alyssais/ruby-pg into alyssais-patch-1
• Merge branch 'YuiOmata-update_require_ruby_bertion'
• Merge branch 'update_require_ruby_bertion' of git://github.com/YuiOmata/ruby-pg into YuiOmata-update_require_ruby_bertion
• Check if the argument for #Connection is an URI
• Add PostgreSQL version information to conditional functions of PG::Result
• Add PostgreSQL version information to conditional functions
• merge from git
• Disable ChangeLog build task of hoe-mercurial in favour of our own.
• Update Windows build dependencies to OpenSSL-1.1.0f and PostgreSQL-9.6.3
• Add a way to disable the deprecation warning.
• Added tag v0.21.0 for changeset deae742eacfa

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