Make the default placeholder views center, but take into account the …

…keyboard frame. (#12)

* Make the default placeholder views center, but take into account the keyboard frame. Also upped to iOS 11+, etc.

* Bump IPHONEOS_DEPLOYMENT_TARGET to 11.0

* Update Xcode image for TravisCI

* Specify cocoapods version 1.7.5

* Fix DemoApp build by adding a dummy Swift file

Merge pull request #11 from manolosavi/manolo/1.0.6

Merge pull request #10 from manolosavi/manolo/1.0.5

Bug fix…

Merge pull request #9 from manolosavi/manolo/1.0.4

Version 1.0.4.

Merge pull request #8 from manolosavi/master

Bug fix.

Bump podspec version. (#7)

Bump podspec version

Minor API change; use -valid/invalidate rather than hasBeenSuperseded (…

…#1)

* Minor API change; use -valid/invalidate rather than hasBeenSuperseded

* Update README, too