Remove unused dependencies (#85)

https://github.com/est31/cargo-udeps reports "thiserror" as unused by all targets: ```shell $ cargo +nightly udeps --all-targets unused dependencies: `helm-templexer v2.0.0 (/home/hmaus/Development/helm-templexer)` └─── dependencies └─── "thiserror" ```
hendrikmaus · Sep 9, 2021 · 7020798 · 7020798
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commit 7020798
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diff --git a/Cargo.lock b/Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
@@ -21,7 +21,6 @@ structopt-flags = "0.3"
 log = "0.4"
 env_logger = "0.8"
 anyhow = "1"
-thiserror = "1"
 serde = "1"
 serde_yaml = "0.8"
 subprocess = "0.2"