Use strip_heredoc where possible

Following up on an observation by @rafaelfranca

https://github.com/rails/rails/pull/10170/files#r3753963

Reduce the number of gsub calls to the two cases where inputs are concatenated
from various sources and with inconsistent indentation.

Also zap extraneous spacing from the sass-rails line... presumably this is a
holdover from a previous time where this aligned the version string with an
adjacent line.
added a test suite for the postgres binary type
this shows a problem with nil values
fix for the bytea/binary nil value bug
interpolate instead of string concat
Merge pull request #10220 from vipulnsward/interpolate_on_string

interpolate instead of string concat
Merge pull request #10214 from mattetti/ar_postgres_bytea

AR postgres binary bug fix
Merge pull request #10178 from rubys/app_base_strip_heredoc

Use strip_heredoc where possible
Revert "fixing bit string test"

This reverts commit cdd293cb963b895ff580eb20d10f5d56ecb3d447.

Reason: This wasn't properly fix.
Add OID::Bit for supporting bit string.
Merge pull request #10225 from kennyj/fix_bit_string_problem

Fix bit string problem
make [] method in router more readable
Merge pull request #10226 from buddhamagnet/master

Make [] method more readable
Use db:test:load instead of db:test:load_schema

db:test:load task should be favored over db:test:load_schema, because it
checks for chosen format (ActiveRecord::Base.schema_format).

closes #10227
Fixed typos in AR CHANGELOG
Merge pull request #10228 from prathamesh-sonpatki/AR-Typos

Fixed typos in AR CHANGELOG
Fix documentation to the custom Deprecator

[ci skip]
The third argument of deprecation_warning is always optional

[ci skip]
replace match with get verb in ActionController::Metal
Merge pull request #10230 from gaurish/remove-match

replace match with get verb in ActionController::Metal
converts the project README to Markdown

We tend to use Markdown for everything but the API, the
README is no longer used as the home page of the API
after 7a5aa72, so we can now migrate it.