exclude examples from crates.io publish

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "frag_gene_scan_rs"
-version = "1.0.0"
+version = "1.0.1"
 authors = ["Felix Van der Jeugt <[email protected]>"]
 edition = "2018"
 license = "GPL-3.0-or-later"
@@ -9,6 +9,7 @@ repository = "https://github.com/unipept/FragGeneScanRs"
 readme = "README.md"
 keywords = ["dna", "protein", "gene"]
 categories = ["command-line-utilities", "science"]
+exclude = ["example/*"]
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html