Update pg requirement from ~> 0.21 to ~> 1.1

[dependabot-preview]

Updates the requirements on pg to permit the latest version.

Changelog

Sourced from pg's changelog.

== v1.1.4 [2019-01-08] Michael Granger [email protected]

• Fix PG::BinaryDecoder::Timestamp on 32 bit systems. # 284
• Add new error-codes of PostgreSQL-11.
• Add ruby-2.6 support for Windows fat binary gems and remove ruby-2.0 and 2.1.

== v1.1.3 [2018-09-06] Michael Granger [email protected]

• Revert opimization that was sometimes causing EBADF in rb_wait_for_single_fd().

== v1.1.2 [2018-08-28] Michael Granger [email protected]

• Don't generate aliases for JOHAB encoding.
  This avoids linking to deprecated/private function rb_enc(db)_alias().

== v1.1.1 [2018-08-27] Michael Granger [email protected]

• Reduce deprecation warnings to only one message per deprecation.

== v1.1.0 [2018-08-24] Michael Granger [email protected]

Deprecated (disable warnings per PG_SKIP_DEPRECATION_WARNING=1):

• Forwarding conn.exec to conn.exec_params is deprecated.
• Forwarding conn.exec_params to conn.exec is deprecated.
• Forwarding conn.async_exec to conn.async_exec_params.
• Forwarding conn.send_query to conn.send_query_params is deprecated.
• Forwarding conn.async_exec_params to conn.async_exec is deprecated.

PG::Connection enhancements:

• Provide PG::Connection#sync_* and PG::Connection#async_* query methods for explicit calling syncronous or asynchronous libpq API.
• Make PG::Connection#exec and siblings switchable between sync and async API per PG::Connection.async_api= and change the default to async flavors.
• Add async flavors of exec_params, prepare, exec_prepared, describe_prepared and describe_portal.
  They are identical to their syncronous counterpart, but make use of PostgreSQL's async API.
• Replace rb_thread_fd_select() by faster rb_wait_for_single_fd() in conn.block and conn.async_exec .
• Add PG::Connection#discard_results .
• Raise an ArgumentError for strings containing zero bytes by #escape, #escape_literal, #escape_identifier, #quote_ident and PG::TextEncoder::Identifier. These methods previously truncated strings.

Result retrieval enhancements:

• Add PG::Result#tuple_values to retrieve all field values of a row as array.
• Add PG::Tuple, PG::Result#tuple and PG::Result#stream_each_tuple .
  PG::Tuple offers a way to lazy cast result values.
• Estimate PG::Result size allocated by libpq and notify the garbage collector about it when running on Ruby-2.4 or newer.
• Make the estimated PG::Result size available to ObjectSpace.memsize_of(result) .

Type cast enhancements:

• Replace Ruby code by a faster C implementation of the SimpleDecoder's timestamp decode functions. github #20

... (truncated)

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