[Bugfix] Skip headers when parsing csv

[dgigafox]

Fix bug where headers are included when parsing the source CSV

Actual result:

iex(1)> Airports.all() |> List.first()
%Airports.Airport{
  continent: "continent",
  elevation_ft: "elevation_ft",
  gps_code: "gps_code",
  home_link: "home_link",
  iata_code: "iata_code",
  ident: "ident",
  iso_country: "iso_country",
  iso_region: "iso_region",
  keywords: "keywords",
  latitude: "latitude_deg",
  local_code: "local_code",
  longitude: "longitude_deg",
  municipality: "municipality",
  name: "name",
  scheduled_service: "scheduled_service",
  type: "type",
  wikipedia_link: "wikipedia_link"
}

Expected result:

iex(1)> Airports.all() |> List.first()
%Airports.Airport{
  continent: "NA",
  elevation_ft: "11",
  gps_code: "00A",
  home_link: "",
  iata_code: "",
  ident: "00A",
  iso_country: "US",
  iso_region: "US-PA",
  keywords: "",
  latitude: "40.07080078125",
  local_code: "00A",
  longitude: "-74.93360137939453",
  municipality: "Bensalem",
  name: "Total Rf Heliport",
  scheduled_service: "no",
  type: "heliport",
  wikipedia_link: ""
}

[sjoulbak]

Closed by #22