Delete `test.rake` file.

tasks/test.rake

@@ -1,11 +0,0 @@
-#!/usr/bin/env rake
-
-desc 'test'
-task :test do
-  cd 'content/post' do
-    sh 'grep -l ecx.images-amazon.com *.md | sort | uniq | xargs sed -ie "s/http:\/\/ecx.images-amazon.com/https:\/\/images-na.ssl-images-amazon.com/g"'
-    sh 'grep -l "http://www.amazon.co.jp/exec" *.md | sort | uniq | xargs sed -i -e "s/http:\/\/www.amazon.co.jp\/exec/https:\/\/www.amazon.co.jp\/exec/g"'
-    sh 'rm *.mde || true'
-    sh 'rm *.md-e || true'
-  end
-end