Fix ruby-2.6.0-rc1 announcement file exts (en, ja) (#1911)

Author: havenwood

en/news/_posts/2018-12-06-ruby-2-6-0-rc1-released.md

@@ -111,14 +111,14 @@ Enjoy programming with Ruby 2.6.0-rc1!
 
 ## Download
 
-* <https://cache.ruby-lang.org/pub/ruby/2.6/ruby-2.6.0-rc1.tar.bz2>
+* <https://cache.ruby-lang.org/pub/ruby/2.6/ruby-2.6.0-rc1.tar.gz>
 
       SIZE:   16823448 bytes
       SHA1:   889db7731fd43f6dbf7f31ffdb0a29bba1a8d356
       SHA256: 6d6183639ed9c02320d7132e97c65489a39e24d8b55fc4ed35ac53d1189cb61d
       SHA512: ad101adee5c43f3645561e73970f15d4e9141f707da69a92e224575c665949e18ca53389e5315fca2ea393
 4d77967a59e304353cde4a915537e7c4e4ee20be73
-* <https://cache.ruby-lang.org/pub/ruby/2.6/ruby-2.6.0-rc1.tar.bz2>
+* <https://cache.ruby-lang.org/pub/ruby/2.6/ruby-2.6.0-rc1.zip>
 
       SIZE:   20737499 bytes
       SHA1:   457e39aee1978da5e42af42a6ad230421544aa07
@@ -130,7 +130,7 @@ Enjoy programming with Ruby 2.6.0-rc1!
       SHA1:   269fe9d414d7731e4a63959fadffe5c50c08ce0e
       SHA256: b4e9c0e8801946e9f0baba30948955f4341e9e04f363c206b7bd774208053eb5
       SHA512: cbd6281b2aab6fbce3f699c1ab57e5423304dca7a547a0b3cd4e8e980326dc7b85b2ca2bfaf3f3a648d40f4222fdf1740d81d422790ee7ae1ba1ed33eb11e3e8
-* <https://cache.ruby-lang.org/pub/ruby/2.6/ruby-2.6.0-rc1.tar.bz2>
+* <https://cache.ruby-lang.org/pub/ruby/2.6/ruby-2.6.0-rc1.tar.xz>
 
       SIZE:   11851908 bytes
       SHA1:   3b93fdf1c5bd969ab4fe0a8176a6cf64e4597e6e

ja/news/_posts/2018-12-06-ruby-2-6-0-rc1-released.md

@@ -93,14 +93,14 @@ Ruby 2.6では `RubyVM::AbstractSyntaxTree` モジュールが導入されまし
 
 ## Download
 
-* <https://cache.ruby-lang.org/pub/ruby/2.6/ruby-2.6.0-rc1.tar.bz2>
+* <https://cache.ruby-lang.org/pub/ruby/2.6/ruby-2.6.0-rc1.tar.gz>
 
       SIZE:   16823448 bytes
       SHA1:   889db7731fd43f6dbf7f31ffdb0a29bba1a8d356
       SHA256: 6d6183639ed9c02320d7132e97c65489a39e24d8b55fc4ed35ac53d1189cb61d
       SHA512: ad101adee5c43f3645561e73970f15d4e9141f707da69a92e224575c665949e18ca53389e5315fca2ea393
 4d77967a59e304353cde4a915537e7c4e4ee20be73
-* <https://cache.ruby-lang.org/pub/ruby/2.6/ruby-2.6.0-rc1.tar.bz2>
+* <https://cache.ruby-lang.org/pub/ruby/2.6/ruby-2.6.0-rc1.zip>
 
       SIZE:   20737499 bytes
       SHA1:   457e39aee1978da5e42af42a6ad230421544aa07
@@ -112,7 +112,7 @@ Ruby 2.6では `RubyVM::AbstractSyntaxTree` モジュールが導入されまし
       SHA1:   269fe9d414d7731e4a63959fadffe5c50c08ce0e
       SHA256: b4e9c0e8801946e9f0baba30948955f4341e9e04f363c206b7bd774208053eb5
       SHA512: cbd6281b2aab6fbce3f699c1ab57e5423304dca7a547a0b3cd4e8e980326dc7b85b2ca2bfaf3f3a648d40f4222fdf1740d81d422790ee7ae1ba1ed33eb11e3e8
-* <https://cache.ruby-lang.org/pub/ruby/2.6/ruby-2.6.0-rc1.tar.bz2>
+* <https://cache.ruby-lang.org/pub/ruby/2.6/ruby-2.6.0-rc1.tar.xz>
 
       SIZE:   11851908 bytes
       SHA1:   3b93fdf1c5bd969ab4fe0a8176a6cf64e4597e6e