Update module lib/pq to v1

This MR contains the following updates:

Package	Type	Update	Change
github.com/lib/pq	require	major	v0.0.0-20190326042056-d6156e141ac6 -> v1.9.0

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Release Notes

lib/pq

v1.9.0

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• better errors on network failures
• fully implement database/sql/driver.Driver
• improved query cancellation from contexts
• support int32/float32/[]byte slices in Array

v1.8.0

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• Change Kerberos connection string parameters:
  • service is now krbsrvname
  • spn is now krbspn

v1.7.1

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• Fix Kerberos build on Windows
• Return rows affected for COPY

v1.7.0

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• Changed GSS API so that default package doesn't have any dependencies.

v1.6.0

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• Add GSS auth support
• Fix for current map write when using unix sockets

v1.5.2

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• fix 2400 time encoding for time/timetz

v1.5.1

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• Improved notification handler.

v1.5.0

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• Added notification handler.

v1.4.0

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• Add a notice handler func.
• Bump oldest supported Go version to 1.13.
• Improve aix and plan9 support.

v1.3.0

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• Improved Ping support, now works correctly even during a failed transaction.
• Fix nil pointer dereference when calling RowsAffected on the result of a 0-item CopyIn

v1.2.0

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• Add QuoteLiteral function
• Fix connection leak on SSL failure
• Fix Rollback in commit
• Drop tested support for Go < 1.11
• Drop tested support for Postgres < 9.4

v1.1.1

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• Fix parsing of FLOAT4 types.

v1.1.0

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• Removed support for Go 1.8 and below. Go 1.9 or above is now required.
• Implemented the Pinger interface.
• Support returning multiple result sets from a single query.
• Add SCRAM-SHA-256 authentication.

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