Revert "Update BLAS dependency. (#768)"

Reason for revert: breaking change, will be re-applied after minor
release is out.

This reverts commit fdeb35a.

Author: bluss

.gitignore

@@ -1,3 +1,2 @@
 Cargo.lock
 target/
-.idea/

Cargo.toml

@@ -38,7 +38,7 @@ approx = { version = "0.3.2", optional = true }
 
 # Use via the `blas` crate feature!
 cblas-sys = { version = "0.1.4", optional = true, default-features = false }
-blas-src = { version = "0.4.0", optional = true, default-features = false }
+blas-src = { version = "0.2.0", optional = true, default-features = false }
 
 matrixmultiply = { version = "0.2.0" }
 serde = { version = "1.0", optional = true }

blas-tests/Cargo.toml

@@ -10,7 +10,7 @@ test = false
 [dev-dependencies]
 approx = "0.3.2"
 ndarray = { path = "../", features = ["approx", "blas"] }
-blas-src = { version = "0.4.0", default-features = false, features = ["openblas"] }
-openblas-src = { version = "0.7.0", default-features = false, features = ["cblas", "system"] }
+blas-src = { version = "0.2.0", default-features = false, features = ["openblas"] }
+openblas-src = { version = "0.6.0", default-features = false, features = ["cblas", "system"] }
 defmac = "0.2"
 num-traits = "0.2"