Unit tests (#5)

* test: added few tests in internal package

* fix: reviewdog yaml added, some unit tests are updated.

* lint error fixed

* fix: reviewdog is removed

* fix: ignore cmd by codecov

* fix: updated ci workflow

* test: unit tests added

* test:unit tests updated

* test: more unit tests related to response structs, reviewdog workflow.

* fix: reviewdog workflow corrected

* fix: reviewdog yaml

* fix: reviedog workflow

* fix: reviewdog workflow

* fix: release workflow

* fix: go-version in reviewdog.yaml

* fix: publish workflow added

.github/workflows/publish.yaml

@@ -0,0 +1,13 @@
+on:
+    release:
+      types:
+        - published
+name: Update Go Module Index
+jobs:
+    bump-index:
+      runs-on: ubuntu-latest
+      steps:
+        - name: Checkout repo
+          uses: actions/checkout@v3
+        - name: Ping endpoint
+          run: curl "https://proxy.golang.org/github.com/r-goswami/email-validator/@v/$(git describe HEAD --tags --abbrev=0).info"