Bump LLVM compat (#13)

Author: maleadt

Project.toml

@@ -1,13 +1,13 @@
 name = "UnsafeAtomicsLLVM"
 uuid = "d80eeb9a-aca5-4d75-85e5-170c8b632249"
 authors = ["Takafumi Arakaki <[email protected]> and contributors"]
-version = "0.1.4"
+version = "0.1.5"
 
 [deps]
 LLVM = "929cbde3-209d-540e-8aea-75f648917ca0"
 UnsafeAtomics = "013be700-e6cd-48c3-b4a1-df204f14c38f"
 
 [compat]
-LLVM = "6, 7"
+LLVM = "6, 7, 8"
 UnsafeAtomics = "0.2"
 julia = "1.6"