Fix typo in that broke installation in cmake

closes #221
diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
index d2a29c5..af5f173 100644
--- a/library/CMakeLists.txt
+++ b/library/CMakeLists.txt
@@ -131,7 +131,7 @@
     set_target_properties(${mbedtls_static_target} PROPERTIES OUTPUT_NAME mbedtls)
     target_link_libraries(${mbedtls_static_target} ${libs} ${mbedx509_static_target})
 
-    install(TARGETS ${mbedtls_static_target} ${mbedx509_static_target} ${mbedcrypt_static_target}
+    install(TARGETS ${mbedtls_static_target} ${mbedx509_static_target} ${mbedcrypto_static_target}
             DESTINATION ${LIB_INSTALL_DIR}
             PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE)
 endif(USE_STATIC_MBEDTLS_LIBRARY)