bump elixir versions (#106)

.travis.yml

@@ -1,19 +1,12 @@
 language: elixir
-sudo: false
 elixir:
   - 1.3.4
   - 1.4.5
+  - 1.5.1
 otp_release:
   - 19.3
-  - 20.0
-before_script:
-  - kerl list installations
 script:
   - mix test && mix credo --strict && mix dialyzer --halt-exit-status
 notifications:
   recipients:
     - [email protected]
-matrix:
-  exclude:
-    - otp_release: 20.0
-      elixir: 1.3.4

lib/faker/datetime.ex

@@ -41,12 +41,14 @@ defmodule Faker.DateTime do
 
   # private
 
+  @spec date_to_datetime(Date.t) :: DateTime.t
   defp date_to_datetime(date) do
     %DateTime{calendar: Calendar.ISO, day: date.day, hour: 0, minute: 0,
               month: date.month, second: 0, time_zone: "Etc/UTC",
               utc_offset: 0, std_offset: 0, year: date.year, zone_abbr: "UTC"}
   end
 
+  @spec naivedatetime_to_datetime(NaiveDateTime.t) :: DateTime.t
   defp naivedatetime_to_datetime(naivedatetime) do
     %DateTime{calendar: naivedatetime.calendar, day: naivedatetime.day,
               hour: naivedatetime.hour, minute: naivedatetime.minute,