Use Context suffix for snafu error contexts (#1068)

src/config.rs

@@ -416,7 +416,7 @@ impl Config {
   }
 
   pub(crate) fn from_matches(matches: &ArgMatches) -> ConfigResult<Self> {
-    let invocation_directory = env::current_dir().context(config_error::CurrentDirSnafu)?;
+    let invocation_directory = env::current_dir().context(config_error::CurrentDirContext)?;
 
     let verbosity = if matches.is_present(arg::QUIET) {
       Verbosity::Quiet

src/config_error.rs

@@ -1,7 +1,7 @@
 use crate::common::*;
 
 #[derive(Debug, Snafu)]
-#[snafu(visibility(pub(crate)))]
+#[snafu(visibility(pub(crate)), context(suffix(Context)))]
 pub(crate) enum ConfigError {
   #[snafu(display("Failed to get current directory: {}", source))]
   CurrentDir { source: io::Error },