README.md in polyfill-1.3.0 vs README.md in polyfill-1.4.0

@@ -25,11 +25,11 @@
 ## Installation
 
 Add it to your Gemfile:
 
 ```ruby
-gem 'polyfill', '~> 1.3'
+gem 'polyfill', '~> 1.4'
 ```
 
 Or install it manually:
 
 ```sh
@@ -217,18 +217,18 @@
 | ✓ |                  | #casecmp?                | Returns `nil` for non-string arguments instead of raising a `TypeError`.
 | ✓ |                  | #delete_prefix           | New
 | P |                  | #delete_prefix!          | New **Differences:** Throws `RuntimeError` instead of `FrozenError` when attempting to modify a frozen string.
 | ✓ |                  | #delete_suffix           | New (alias of `chomp`)
 | P |                  | #delete_suffix!          | New (alias of `chomp!`) **Differences:** Throws `RuntimeError` instead of `FrozenError` when attempting to modify a frozen string.
-| ✗ |                  | #each_grapheme_cluster   | New
-| ✗ |                  | #grapheme_clusters       | New
+| ✓ |                  | #each_grapheme_cluster   | New
+| ✓ |                  | #grapheme_clusters       | New
 | P |                  | #start_with?             | Accepts regular expression arguments. **Differences:** Does not set `Regexp` globals.
 | ✗ |                  | #undump                  | New
 | ✗ | StringIO         | #write                   | Accepts multiple arguments.
 | ✗ | StringScanner    | #captures                | New
 | ✗ |                  | #size                    | New
 | ✗ |                  | #values_at               | New
-| ✗ | Struct           | .new                     | Accepts a new optional keyword argument, `:keyword_init`.
+| ✓ | Struct           | .new                     | Accepts a new optional keyword argument, `:keyword_init`.
 | ✗ | Thread           | #fetch                   | New
 | ✗ |                  | #name=                   | Description set by `Thread#name=` is now visible on Windows 10.
 | ✓ | Time             | .at                      | Accepts a third argument which specifies the unit of the second argument.
 | ✗ | URI              | .open                    | New (alias of `Kernel.open`)
 | ✗ | Zlib::GzipWriter | #write                   | Accepts multiple arguments.