fix(ios): prevent tree shaking by including dummy function

Signed-off-by: Amogh Lele <amolele@gmail.com>

ios/Classes/EnforceBinding.swift

@@ -0,0 +1,3 @@
+public func dummyMethodToEnforceBundling() {
+    enforce_binding() // disable tree shaking
+}

ios/Classes/binding.h

@@ -0,0 +1 @@
+void enforce_binding();

ios/Classes/readability.c

@@ -1,3 +1,3 @@
 // Relative import to be able to reuse the C sources.
 // See the comment in ../{projectName}}.podspec for more information.
-#include "../../src/readability.c"
+// #include "../../src/readability.c"