title: When you run jest --coverage, what does the Branches column do/mean?
body: <p>I ran my tests and this is what I received:</p>
  
  <p><code>---------------|----------|----------|----------|----------|-------------------|
  File           |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
  ---------------|----------|----------|----------|----------|-------------------|
  All files      |      100 |        0 |      100 |      100 |                   |
   Search        |      100 |      100 |      100 |      100 |                   |
    index.js     |      100 |      100 |      100 |      100 |                   |
   SearchResults |      100 |        0 |      100 |      100 |                   |
    index.js     |      100 |        0 |      100 |      100 |                 4 |
  ---------------|----------|----------|----------|----------|-------------------|
  Test Suites: 2 passed, 2 total
  Tests:       5 passed, 5 total
  Snapshots:   1 passed, 1 total
  Time:        4.678s
  </code>
  I've changed something and now I have 0% on Branch column but I don't know what it means in order to improve it.</p>