Fixed an issue with ignored package being included in PR body incorrectly (#38)

__fixtures__/simple-project/.changeset/config.json

@@ -0,0 +1,3 @@
+{
+  "$schema": "https://unpkg.com/@changesets/config@1.3.0/schema.json"
+}

__fixtures__/simple-project/package.json

@@ -0,0 +1,8 @@
+{
+  "private": true,
+  "name": "simple-project",
+  "version": "1.0.0",
+  "workspaces": [
+    "packages/*"
+  ]
+}

__fixtures__/simple-project/packages/pkg-a/package.json

@@ -0,0 +1,7 @@
+{
+  "name": "simple-project-pkg-a",
+  "version": "1.0.0",
+  "dependencies": {
+    "simple-project-pkg-b": "1.0.0"
+  }
+}

__fixtures__/simple-project/packages/pkg-b/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "simple-project-pkg-b",
+  "version": "1.0.0"
+}