fix: properly reset semver values when bumping

The previous implementation was too naive. For example, when bumping a
minor version the patch would remain. Now it will properly reset the
lower version values to 0. Prerelease and build version numbers are
reset to empty, so these will need to be specified manually to be used.

src/versioning.rs

@@ -231,14 +231,23 @@ pub fn increment_version(
         VersionIncrement::Manual(version) => version,
         VersionIncrement::Major => {
             version.major += 1;
+            version.minor = 0;
+            version.patch = 0;
+            version.build = semver::BuildMetadata::EMPTY;
+            version.pre = semver::Prerelease::EMPTY;
             version
         }
         VersionIncrement::Minor => {
             version.minor += 1;
+            version.patch = 0;
+            version.build = semver::BuildMetadata::EMPTY;
+            version.pre = semver::Prerelease::EMPTY;
             version
         }
         VersionIncrement::Patch => {
             version.patch += 1;
+            version.build = semver::BuildMetadata::EMPTY;
+            version.pre = semver::Prerelease::EMPTY;
             version
         }
     }