Problem parsing == in expressions in REPL

[rtfeldman]

If you try to use == in a top-level elm repl expression, and don't wrap it in parens, you now get a parse error.

SSCCE

False : Bool
> 3 == 4
-- PARSE ERROR ------------------------------------------------------------- elm

Something went wrong while parsing your code.

3| 3 == 4
   ^
I was expecting:

  - a declaration, like `x = 5` or `type alias Model = { ... }`
  - the `import` keyword
  - a doc comment, like {-| this -}
> (3 == 4)
False : Bool

3 == 4 works as expected in 0.18 elm repl.