v0.20.0

• Fix: support arrow functions in no-extra-parens (fixes #2367) (Michael Ficarra)
• Fix: Column position in space-infix-ops rule (fixes #2354) (Gyandeep Singh)
• Fix: allow plugins to be namespaced (fixes #2360) (Seth Pollack)
• Update: one-var: enable let & const (fixes #2301) (Joey Baker)
• Docs: Add meteor to avaiable environments list (bartmichu)
• Update: Use Object.assign() polyfill for all object merging (fixes #2348) (Sindre Sorhus)
• Docs: Update markdownlint dependency, resolve/suppress new issues. (David Anson)
• Fix: newline-after-var declare and export (fixes #2325) (Gyandeep Singh)
• Docs: Some typos and grammar. (AlexKVal)
• Fix: newline-after-var to ignore declare in for specifiers (fixes #2317) (Gyandeep Singh)
• New: add --stdin-filename option (fixes #1950) (Mordy Tikotzky)
• Fix: Load .eslintrc in $HOME only if no other .eslintrc is found (fixes #2279) (Jasper Woudenberg)
• Fix: Add v8 module to no-mixed-requires rule (fixes #2320) (Gyandeep Singh)
• Fix: key-spacing with single properties (fixes #2311) (Brandon Mills)
• Docs: no-invalid-regexp: add ecmaFeatures flags for u/y (Jordan Harband)
• New: object-shorthand rule (refs: #1617) (Jamund Ferguson)
• Update: backticks support for quotes rule (fixes #2153) (borislavjivkov)
• Fix: space-in-brackets to work with modules (fixes #2216) (Nicholas C. Zakas)