Finish verion 0.1.0

docs/requirement_docs.md

@@ -767,6 +767,11 @@ GeoIP:
 * `NETTOOL_GEOIP_COUNTRY_DB`
 * `NETTOOL_GEOIP_ASN_DB`
 
+Lookup order:
+1) Environment variable path
+2) `data/` next to the CLI binary
+3) `data/` in the current working directory
+
 Logging:
 
 * `NETTOOL_LOG_LEVEL`