undo s-c v4 requirement

Loosening this so all users can benefit from the single comment
interpolation fix. At the moment, the only v4+ change is the no
tags entry rewrite, which we can feature detect to enable.

Author: quantizor

package.json

@@ -23,11 +23,10 @@
     "rimraf": "^2.6.2"
   },
   "dependencies": {
-    "@babel/helper-annotate-as-pure": "^7.0.0-beta.37",
     "lodash": "^4.17.10"
   },
   "peerDependencies": {
-    "styled-components": ">= 4.0"
+    "styled-components": ">= 2"
   },
   "scripts": {
     "clean": "rimraf lib",

yarn.lock

@@ -2,20 +2,6 @@
 # yarn lockfile v1
 
 
-"@babel/helper-annotate-as-pure@^7.0.0-beta.37":
-  version "7.0.0-beta.38"
-  resolved "https://registry.yarnpkg.com/@babel/helper-annotate-as-pure/-/helper-annotate-as-pure-7.0.0-beta.38.tgz#888cf28a1b9094d670dbdb1be1ec550b40c2dd9c"
-  dependencies:
-    "@babel/types" "7.0.0-beta.38"
-
-"@babel/[email protected]":
-  version "7.0.0-beta.38"
-  resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.0.0-beta.38.tgz#2ce2443f7dc6ad535a67db4940cbd34e64035a6f"
-  dependencies:
-    esutils "^2.0.2"
-    lodash "^4.2.0"
-    to-fast-properties "^2.0.0"
-
 abab@^1.0.3:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/abab/-/abab-1.0.3.tgz#b81de5f7274ec4e756d797cd834f303642724e5d"
@@ -2675,10 +2661,6 @@ to-fast-properties@^1.0.3:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/to-fast-properties/-/to-fast-properties-1.0.3.tgz#b83571fa4d8c25b82e231b06e3a3055de4ca1a47"
 
-to-fast-properties@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/to-fast-properties/-/to-fast-properties-2.0.0.tgz#dc5e698cbd079265bc73e0377681a4e4e83f616e"
-
 tough-cookie@^2.3.2, tough-cookie@~2.3.0:
   version "2.3.2"
   resolved "https://registry.yarnpkg.com/tough-cookie/-/tough-cookie-2.3.2.tgz#f081f76e4c85720e6c37a5faced737150d84072a"