add support for semver crate (#238)

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Co-authored-by: Omar Tawfik <15987992+OmarTawfik@users.noreply.github.com>

schemars/tests/expected/semver.json

@@ -0,0 +1,12 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "SemverTypes",
+  "type": "object",
+  "required": ["version"],
+  "properties": {
+    "version": {
+      "type": "string",
+      "pattern": "^(0|[1-9]\\d*)\\.(0|[1-9]\\d*)\\.(0|[1-9]\\d*)(?:-((?:0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\\.(?:0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\\+([0-9a-zA-Z-]+(?:\\.[0-9a-zA-Z-]+)*))?$"
+    }
+  }
+}

schemars/tests/semver.rs

@@ -0,0 +1,15 @@
+mod util;
+use schemars::JsonSchema;
+use semver::Version;
+use util::*;
+
+#[allow(dead_code)]
+#[derive(JsonSchema)]
+struct SemverTypes {
+    version: Version,
+}
+
+#[test]
+fn semver_types() -> TestResult {
+    test_default_generated_schema::<SemverTypes>("semver")
+}