Merge pull request #375 from alphaville/dependabot/cargo/lbfgs-0.3

Update lbfgs requirement from 0.2 to 0.3

Author: alphaville

Cargo.toml

@@ -80,7 +80,7 @@ rustdoc-args = ["--html-in-header", "katex-header.html"]
 num = "0.4"
 
 # Our own stuff - L-BFGS: limited-memory BFGS directions
-lbfgs = "0.2"
+lbfgs = "0.3"
 
 # Instant is a generic timer that works on Wasm (with wasm-bindgen)
 instant = { version = "0.1" }