Add new API Property - is_landlocked

[sthiepaan]

After short introduction in #32 we decided to extend this package with is_landlocked Property:

• is_landlocked Property is a Boolean

After adding new property, each Country {Object} should contain:

{
  "country": "poland",
  "capital": "warsaw",
  "currency": "zloty",
  "native_language": ["polish"],
  "famous_for": "pierogi and potatoes",
  "phone_code": "+48",
  "flag": "https://flagpedia.net/data/flags/h80/pl.png",
  "drive_direction": "right",
  // NEW DATA
  "is_landlocked": false
},

Additionally there will be new method to use that data:

• getCountriesByLandlock(isLandLocked)

[jav7zaid]

@bhatvikrant can you assign this to me? I think this would be good first issue and contribution ? Thanks 👍

[bhatvikrant]

@jav7zaid Sure thing! I have assigned this issue to you.
All the best!
Also, please don't forget to mention your source of data in the PR.😀

[jav7zaid]

@bhatvikrant thanks! 😄

[jav7zaid]

@sthiepaan can you please open this PR , i need to fix the existing test cases that broke.

[sthiepaan]

Sure 👍 Can you make a new Pull Request with fix for that?
Nevermind, I will fix it. Thank you @jav7zaid for all your efforts!