fix(semver): replace operatorless ranges rather than bump

lib/versioning/semver/range.js

@@ -52,6 +52,9 @@ function getNewValue(currentValue, rangeStrategy, fromVersion, toVersion) {
   // Simple range
   if (rangeStrategy === 'bump') {
     if (parsedRange.length === 1) {
+      if (!element.operator) {
+        return getNewValue(currentValue, 'replace', fromVersion, toVersion);
+      }
       if (element.operator === '^') {
         const split = currentValue.split('.');
         if (suffix.length) {

test/versioning/semver.spec.js

@@ -86,6 +86,15 @@ describe('semver.getNewValue()', () => {
   it('bumps naked tilde', () => {
     expect(semver.getNewValue('~1', 'bump', '1.0.0', '1.1.7')).toEqual('~1');
   });
+  it('bumps naked major', () => {
+    expect(semver.getNewValue('5', 'bump', '5.0.0', '5.1.7')).toEqual('5');
+    expect(semver.getNewValue('5', 'bump', '5.0.0', '6.1.7')).toEqual('6');
+  });
+  it('bumps naked minor', () => {
+    expect(semver.getNewValue('5.0', 'bump', '5.0.0', '5.0.7')).toEqual('5.0');
+    expect(semver.getNewValue('5.0', 'bump', '5.0.0', '5.1.7')).toEqual('5.1');
+    expect(semver.getNewValue('5.0', 'bump', '5.0.0', '6.1.7')).toEqual('6.1');
+  });
   it('replaces equals', () => {
     expect(semver.getNewValue('=1.0.0', 'replace', '1.0.0', '1.1.0')).toEqual(
       '=1.1.0'