Raise default NIF version to 2.15

Author: filmor

rustler/Cargo.toml

@@ -9,7 +9,7 @@ readme = "../README.md"
 edition = "2018"
 
 [features]
-default = ["derive", "nif_version_2_14"]
+default = ["derive", "nif_version_2_15"]
 derive = ["rustler_codegen"]
 alternative_nif_init_name = []
 nif_version_2_14 = ["rustler_sys/nif_version_2_14"]

rustler_sys/Cargo.toml

@@ -35,8 +35,7 @@ build = "build.rs"
 categories = ["external-ffi-bindings"]
 
 [features]
-# Default version: 2.14
-default = ["nif_version_2_14"]
+default = ["nif_version_2_15"]
 nif_version_2_14 = []
 nif_version_2_15 = ["nif_version_2_14"]
 nif_version_2_16 = ["nif_version_2_15"]