In deno itself:

- Rename Deno.build.gnArgs to Deno.build.args (#1912, #1909)
- Upgrade to TypeScript 3.3 (#1908)
- Basic Arm64 support (#1887)
- Remove builtin "deno" module, use Deno global var (#1895)
- Improvements to internal deno_core crate (#1904, #1914)
- Add --no-prompt flag for non-interactive environments (#1913)

In deno_std

- Add fs extras: ensureDir, ensireFile, readJson, emptyDir, move,
  exists (#269, #266, #264, #263, #260)
- Datetime module improvement (#259)
- asserts: Add unimplemented, unreachable, assertNotEquals,
  assertArrayContains (#246, #248)