Improve Filtering of Swift Symbols (#28)

* Improve Filtering of Swift Symbols

- If an Objective-C class has the title `Swift` in it e.g `SentrySwiftAsyncIntegration` then it was being excluded from the list of symbols to mangle.
- Added improved Swift Symbol filtering so that we only target actual Swift symbols

Updated cocoapods to version 1.14 (#27)

* updated cocoapods to version 1.14

* change activesupport version

Bumped version

Merge pull request #24 from intercom/brian/swift_symbols

Strip Additional Swift Symbols from Mangling

Merge pull request #22 from intercom/james/1.1.0

Bump version to 1.1.0

Merge pull request #18 from intercom/naren/update-gem-version

Update Gem version

Merge pull request #11 from intercom/james/builder_spec

Clean when building + specs