doc: update docs/ruby.md (#448)
* add doc for pg_upgrade * add doc for ruby bundle lock
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		@@ -83,6 +83,12 @@ gem 'rspec', :require => 'spec'
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$ bundle install
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```
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解决开发用 mac,生产用 linux 出现的 Gemfile.lock 不一致问题
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```bash
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bundle lock --add-platform x86_64-linux
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```
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### 安装特定 ruby gem 的特定版本
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```bash
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