Update the version of the library to 2.1.18
diff --git a/include/mbedtls/version.h b/include/mbedtls/version.h
index ca95402..05a381d 100644
--- a/include/mbedtls/version.h
+++ b/include/mbedtls/version.h
@@ -39,16 +39,16 @@
  */
 #define MBEDTLS_VERSION_MAJOR  2
 #define MBEDTLS_VERSION_MINOR  1
-#define MBEDTLS_VERSION_PATCH  17
+#define MBEDTLS_VERSION_PATCH  18
 
 /**
  * The single version number has the following structure:
  *    MMNNPP00
  *    Major version | Minor version | Patch version
  */
-#define MBEDTLS_VERSION_NUMBER         0x02011100
-#define MBEDTLS_VERSION_STRING         "2.1.17"
-#define MBEDTLS_VERSION_STRING_FULL    "mbed TLS 2.1.17"
+#define MBEDTLS_VERSION_NUMBER         0x02011200
+#define MBEDTLS_VERSION_STRING         "2.1.18"
+#define MBEDTLS_VERSION_STRING_FULL    "mbed TLS 2.1.18"
 
 #if defined(MBEDTLS_VERSION_C)