Jump to definition functionality broken by multi-line aliasing

[vderyagin]

Using alias like this:

alias A.{
  B,
  C
}

breaks alchemist-goto-definition-at-point for modules B and C, while this:

alias A.{B, C}

works just fine.

Alchemist version: 1.8.2 (package: 20180312.604)

There were other alias-related goto-definition issues, I'll link to them here just in case: #242, #195, #172.