Release 0.3.7 to fix compilation on rust >= 2020-03-03

Author: Jiajie Chen

Cargo.toml

@@ -5,7 +5,7 @@ documentation = "https://docs.rs/buddy_system_allocator"
 homepage = "https://github.com/rcore-os/buddy_system_allocator"
 repository = "https://github.com/rcore-os/buddy_system_allocator"
 keywords = ["allocator", "no_std", "heap"]
-version = "0.3.6"
+version = "0.3.7"
 authors = ["Jiajie Chen <noc@jiegec.ac.cn>"]
 edition = "2018"
 license = "MIT"
@@ -19,4 +19,4 @@ version = "0.5"
 optional = true
 
 [dependencies]
-rustversion = "1.0"
+rustversion = "1.0"