Use relaxed dependency versions (pre 0.12) for better build compat with m-c (#66)

Signed-off-by: Victor Porof <victor.porof@gmail.com>

Cargo.toml

@@ -33,9 +33,9 @@ members = [
 ]
 
 [dependencies]
-bitflags = "1.1.0"
-byteorder = "1.3.2"
-libc = "0.2.62"
+bitflags = "1"
+byteorder = "1"
+libc = "0.2"
 
 # In order to ensure that we test lmdb-rkv in CI against the in-tree version
 # of lmdb-rkv-sys, we specify the dependency as a path here.
@@ -48,8 +48,8 @@ libc = "0.2.62"
 lmdb-rkv-sys = { path = "./lmdb-sys" }
 
 [dev-dependencies]
-rand = "0.4.6"
-tempdir = "0.3.7"
+rand = "0.4"
+tempdir = "0.3"
 
 [features]
 default = []

lmdb-sys/Cargo.toml

@@ -24,12 +24,12 @@ travis-ci = { repository = "mozilla/lmdb-rs" }
 appveyor = { repository = "mozilla/lmdb-rs" }
 
 [dependencies]
-libc = "0.2.62"
+libc = "0.2"
 
 [build-dependencies]
-pkg-config = "0.3.15"
-cc = "1.0.41"
-bindgen = "0.51.0"
+pkg-config = "0.3"
+cc = "1.0"
+bindgen = "0.51"
 
 [features]
 default = []