fix podspec
fix podspec

akiroom/AXStretchableHeaderTabViewController,nickelsberry/AXStretchableHeaderTabViewController,homekuanyi/AXStretchableHeaderTabViewController,homekuanyi/AXStretchableHeaderTabViewController,homekuanyi/AXStretchableHeaderTabViewController,nickelsberry/AXStretchableHeaderTabViewController,jkoroniak/JKStretchableHeaderTabViewController,akiroom/AXStretchableHeaderTabViewController,faridh/FMStretchableHeaderTabViewController,akiroom/AXStretchableHeaderTabViewController,nickelsberry/AXStretchableHeaderTabViewController,jkoroniak/JKStretchableHeaderTabViewController,jkoroniak/JKStretchableHeaderTabViewController