Added documentation, updated readme.

- Added documentation for Chronology.range/2
- Updated README.md with time period info
- Bump version to 0.2.0

README.md

@@ -1,6 +1,6 @@
 # Chronology
 
-This is a simple wrapper around Timex to get date ranges for humanized references, 
+This is a simple wrapper around Timex to get date ranges for humanized references,
 such as `last week`, `past year` etc.
 
 ## Installation
@@ -30,21 +30,24 @@ iex> Chronology.range(:past_year)
  %{
    finish: ~U[2021-06-21 22:06:36.181093Z],
    start: ~U[2021-05-21 22:06:36.180699Z]
- }} 
+ }}
 ```
 
-## Time periods
-- `:today`
-- `:yesterday`
-- `:this_week`
-- `:this_month`
-- `:this_year`
-- `:last_week`
-- `:last_month`
-- `:last_year`
-- `:previous_year`
-- `:past_week`
-- `:past_month`
-- `:past_year`
-- `:this_quarter`
-- `:last_quarter`
+## Time Periods
+
+| time period    | Period description       |
+|----------------|--------------------------|
+| :today         | Today                    |
+| :yesterday     | Yesterday                |
+| :this_week     | The current week         |
+| :this_month    | The current month        |
+| :this_year     | The current year         |
+| :this_quarter  | The current quarter      |
+| :last_week     | The last week (Mon-Sun)  |
+| :last_month    | The last full month      |
+| :last_year     | The last full year       |
+| :last_quarter  | The last quarter         |
+| :past_week     | Past 7 days              |
+| :past_month    | Past month (date to date)|
+| :past_year     | Past 365 days            |
+| :previous_year | 2 years ago              |

mix.exs

@@ -24,7 +24,7 @@ defmodule Chronology.MixProject do
   def project do
     [
       app: :chronology,
-      version: "0.1.1",
+      version: "0.2.0",
       elixir: "~> 1.9",
       start_permanent: Mix.env() == :prod,
       deps: deps()