Removed remaining dropbox style references

Summary:
Since this was removed on v0.51, it no longer makes sense to have those around.
Ideally this should have happened on [this commit](4a393bb).

Reviewed By: cortinico

Differential Revision: D58781951

fbshipit-source-id: 9a9d1efcaf554781acc5cacd09bdbd520ee96bfd

CHANGELOG.md

@@ -18,14 +18,14 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/).
 
 ### Changed
 - Preserves blank spaces between when clauses (https://github.com/facebook/ktfmt/issues/342)
-- Named the default style as `Formatter.META_FORMAT` / `--meta-style`
-- `FormattingOptions` constructor parameters order was changed
+- Named the default style as `Formatter.META_FORMAT` / `--meta-style` (https://github.com/facebook/ktfmt/commit/96a7b1e2539eef43044f676f60400d22265fd115)
+- `FormattingOptions` constructor parameters order was changed (https://github.com/facebook/ktfmt/commit/520706e6d010d48619781d7113e5b1522f07a2ba)
 
 ### Fixed
 - Compilation issues with online formatter (https://github.com/facebook/ktfmt/commit/8605080cb0aadb7eaba20f3b469d6ddafe32c941)
 - Removing valid semicolons (https://github.com/facebook/ktfmt/issues/459)
 - Incorrect detection of unused `assign` import (https://github.com/facebook/ktfmt/issues/411)
 
 ### Removed
-- **Deleted `Formatter.DROPBOX_FORMAT` / `--dropbox-style` (BREAKING CHANGE)**
-- Deleted `FormattingOptions.Style` enum
+- **Deleted `Formatter.DROPBOX_FORMAT` / `--dropbox-style` (BREAKING CHANGE)** (https://github.com/facebook/ktfmt/commit/4a393bb8c1156a4a0fd1ab736c02ca8dbd39a969)
+- Deleted `FormattingOptions.Style` enum (https://github.com/facebook/ktfmt/commit/7edeff14c3738427e53427eb6e39675dc30d1d05)

core/src/test/java/com/facebook/ktfmt/cli/ParsedArgsTest.kt

@@ -66,12 +66,6 @@ class ParsedArgsTest {
     assertThat(parsed.formattingOptions).isEqualTo(Formatter.META_FORMAT)
   }
 
-  @Test
-  fun `parseOptions recognizes --dropbox-style`() {
-    val parsed = assertSucceeds(ParsedArgs.parseOptions(arrayOf("--kotlinlang-style", "foo.kt")))
-    assertThat(parsed.formattingOptions).isEqualTo(Formatter.KOTLINLANG_FORMAT)
-  }
-
   @Test
   fun `parseOptions recognizes --google-style`() {
     val parsed = assertSucceeds(ParsedArgs.parseOptions(arrayOf("--google-style", "foo.kt")))