Remove redundant 'Enabled: true' lines from Rubocop config

[davidstosik]

What

This cleans up a few redundant Enabled: true lines from all our Rubocop configs.

Why

A cop provided by Rubocop is enabled by default. It is not necessary to specify that in our configuration file. The exception to the rule above is "pending" cops, which have been released in recent versions of Rubocop but that the developer did not want to enable by default without warning. If Rubocop runs with cops marked as "pending", it will display the warning message that I have described in #180.

As we now enable new cops by default (until we decide to disable them on a case-by-case), the warning does not show anymore, and it is not necessary to explicitly enable all of them.

Anything else?

Here's a quick before-after.

This is the difference of output for rubocop --show-cops.

```diff --- before.txt 2021-02-17 15:41:23.000000000 +0900 +++ after.txt 2021-02-17 15:57:26.000000000 +0900 @@ -818,7 +818,7 @@ # Supports --auto-correct Layout/SpaceAroundMethodCallOperator: Description: Checks method call operators to not have spaces around them. - Enabled: true + Enabled: pending VersionAdded: '0.82' # Supports --auto-correct @@ -1396,7 +1396,7 @@ Description: Checks for `raise` or `fail` statements which are raising `Exception` class. StyleGuide: "#raise-exception" - Enabled: true + Enabled: pending Safe: false VersionAdded: '0.81' VersionChanged: '0.86' @@ -1571,7 +1571,7 @@ Lint/StructNewOverride: Description: Disallow overriding the `Struct` built-in methods via `Struct.new`. - Enabled: true + Enabled: pending VersionAdded: '0.81' Lint/SuppressedException: @@ -3660,7 +3660,7 @@ Description: When using exponential notation, favor a mantissa between 1 (inclusive) and 10 (exclusive). StyleGuide: "#exponential-notation" - Enabled: true + Enabled: pending VersionAdded: '0.82' EnforcedStyle: scientific SupportedStyles: @@ -3771,7 +3771,7 @@ Style/HashEachMethods: Description: Use Hash#each_key and Hash#each_value. StyleGuide: "#hash-each" - Enabled: true + Enabled: pending VersionAdded: '0.80' Safe: false @@ -3802,7 +3802,7 @@ # Supports --auto-correct Style/HashTransformKeys: Description: Prefer `transform_keys` over `each_with_object`, `map`, or `to_h`. - Enabled: true + Enabled: pending VersionAdded: '0.80' VersionChanged: '0.90' Safe: false @@ -3810,7 +3810,7 @@ # Supports --auto-correct Style/HashTransformValues: Description: Prefer `transform_values` over `each_with_object`, `map`, or `to_h`. - Enabled: true + Enabled: pending VersionAdded: '0.80' VersionChanged: '0.90' Safe: false ```

As you can see, some cops are now displayed as "pending". However, our configuration now keeps them enabled:

https://github.com/cookpad/global-style-guides/blob/7470c0d87765183afca689815d25bc47e6cb73f4/.rubocop.yml#L6-L7

To confirm it, I ran Rubocop on a very short file which contains one of the offenses for which the cop changed from "enabled" to "pending". The change did not affect Rubocop's behaviour, which was the same before and after:

$ cat test.rb
{ a: 1, b: 2 }.each_with_object({}) { |(k, v), h| h[k] = foo(v) }
$ rubocop test.rb
Inspecting 1 file
C

Offenses:

test.rb:1:1: C: Style/HashTransformValues: Prefer transform_values over each_with_object.
{ a: 1, b: 2 }.each_with_object({}) { |(k, v), h| h[k] = foo(v) }
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

1 file inspected, 1 offense detected, 1 offense auto-correctable