fix: adding singular newline breaks

Some commits use only a singular new line to separate the title and the body.

Author: DeveloperC286

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "conventional_commits_linter"
-version = "0.7.0"
+version = "0.7.1"
 description = "A tooling/language agnostic utility to lint Git commit message against the Conventional Commits specification."
 authors = ["C <DeveloperC@protonmail.com>"]
 edition = "2018"

Cargo.toml

@@ -12,3 +12,5 @@ Feature: No descriptions are caught as a Conventional Commits specification viol
       | test:       \n\nCo-authored-by: Renovate Bot <bot@renovateapp.com>\n\n |
       | doc(README):    \n\n                                                   |
       | chore!(release): \n\n                                                  |
+      | chore!(release): \n                                                    |
+      | test:       \nCo-authored-by: Renovate Bot <bot@renovateapp.com>\n\n   |

end-to-end-tests/features/no-description.feature

@@ -5,7 +5,7 @@ use crate::model::LintingError;
 pub fn lint(commit_message: &str) -> Result<(), LintingError> {
     lazy_static! {
         static ref NO_DESCRIPTION_REGEX: Regex = Regex::new(&format!(
-            r"{}([[:space:]]*($|\n\n))",
+            r"{}([[:space:]]*($|\n))",
             *crate::linter::regex::IGNORE_TYPE_AND_SCOPE_LINTING_ERRORS,
         ))
         .unwrap();

src/linter/conventional_commits_specification/no_description/mod.rs

@@ -6,7 +6,8 @@ use super::*;
     commit_message,
     case("fix:"),
     case("chore(release):\n\n"),
-    case("chore(release):  \n\n")
+    case("chore(release):  \n\n"),
+    case("lint: \n")
 )]
 fn test_no_description(commit_message: &str) {
     assert_eq!(lint(commit_message), Err(LintingError::NO_DESCRIPTION));
@@ -17,14 +18,20 @@ fn test_no_description_with_exclamation(commit_message: &str) {
     assert_eq!(lint(commit_message), Err(LintingError::NO_DESCRIPTION));
 }
 
-#[rstest(commit_message, case("  feat: "), case("\tchore:\n\n"))]
+#[rstest(
+    commit_message,
+    case("  feat: "),
+    case("\tchore:\n\n"),
+    case(" major: \n")
+)]
 fn test_no_description_with_preceding_whitespace(commit_message: &str) {
     assert_eq!(lint(commit_message), Err(LintingError::NO_DESCRIPTION));
 }
 
 #[rstest(
     commit_message,
     case("chore(deps):\n\nCo-authored-by: Renovate Bot <bot@renovateapp.com>"),
+    case("chore(deps):   \nCo-authored-by: Renovate Bot <bot@renovateapp.com>"),
     case("chore:    \n\nBumps [node-fetch](https://github.com/bitinn/node-fetch) from 2.6.0 to 2.6.1.\r\n- [Release notes](https://github.com/bitinn/node-fetch/releases)\r\n- [Changelog](https://github.com/node-fetch/node-fetch/blob/master/docs/CHANGELOG.md)\r\n- [Commits](https://github.com/bitinn/node-fetch/compare/v2.6.0...v2.6.1)\r\n\r\nSigned-off-by: dependabot[bot] <support@github.com>\r\n\r\nCo-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>")
 )]
 fn test_no_description_with_body(commit_message: &str) {