Sort SDK version for dropdown using semver package (#839)

Sorting the versions lexicographically was not ordering by latest
correctly, now using `semver` package to sort them:
```ts
> versions = [
  '1.9.0',  '1.8.0',
  '1.7.0',  '1.6.0',
  '1.5.0',  '1.4.0',
  '1.3.0',  '1.2.0',
  '1.12.0', '1.11.0',
  '1.10.0', '1.1.0',
  '1.0.0'
]

> versions.sort((a, b) => semver.rcompare(a, b))
[
  '1.12.0', '1.11.0',
  '1.10.0', '1.9.0',
  '1.8.0',  '1.7.0',
  '1.6.0',  '1.5.0',
  '1.4.0',  '1.3.0',
  '1.2.0',  '1.1.0',
  '1.0.0'
]
```