Update bindgen plugin to version 0.3.1

Regenerate the POSIX regex binding.

Author: jonas

Diff for: bindings/posix/src/main/scala/org/scalanative/bindgen/bindings/posix/regex.scala

@@ -54,6 +54,16 @@ object regex {
       def rm_eo: regoff_t = !p._2
       def rm_eo_=(value: regoff_t): Unit = !p._2 = value
     }
-    def struct_regmatch_t()(implicit z: native.Zone): native.Ptr[struct_regmatch_t] = native.alloc[struct_regmatch_t]
+  }
+
+  object struct_regmatch_t {
+    import implicits._
+    def apply()(implicit z: native.Zone): native.Ptr[struct_regmatch_t] = native.alloc[struct_regmatch_t]
+    def apply(rm_so: regoff_t, rm_eo: regoff_t)(implicit z: native.Zone): native.Ptr[struct_regmatch_t] = {
+      val ptr = native.alloc[struct_regmatch_t]
+      ptr.rm_so = rm_so
+      ptr.rm_eo = rm_eo
+      ptr
+    }
   }
 }

Diff for: project/plugins.sbt

@@ -9,7 +9,7 @@ addSbtPlugin("com.eed3si9n"      % "sbt-buildinfo"              % "0.9.0")
 
 libraryDependencies += "org.scala-sbt" %% "scripted-plugin" % sbtVersion.value
 
-val VERSION = "0.3.0"
+val VERSION = "0.3.1"
 
 //#sbt-plugin-example
 addSbtPlugin("org.scala-native.bindgen" % "sbt-scala-native-bindgen" % VERSION)