fix(dependencies): more permissive peer dependencies and unfix versio…

…n of ra-core

package.json

@@ -266,7 +266,7 @@
     "lint-staged": "^8.1.5",
     "lodash": "^4.17.11",
     "pre-commit": "^1.2.2",
-    "ra-core": "2.8.5",
+    "ra-core": "^2.8.5",
     "raf": "^3.4.1",
     "react": "^16.8.3",
     "react-dom": "^16.8.3",
@@ -309,14 +309,14 @@
     "reselect": "^3.0.0"
   },
   "peerDependencies": {
-    "react": "^16.8.5",
-    "react-dom": "^16.8.5",
-    "ra-core": "^2.8.5",
-    "redux-form": "~7.4.0",
-    "styled-components": "^4.1.3",
-    "redux": "~3.7.2",
-    "react-redux": "~5.0.7",
-    "@bootstrap-styled/redux": "^1.1.2"
+    "react": "^16.0.0",
+    "react-dom": "^16.0.0",
+    "ra-core": "^2.0.0",
+    "redux-form": "~7.0.0",
+    "styled-components": "^4.0.0",
+    "redux": "~3.0.0",
+    "react-redux": "~5.0.0",
+    "@bootstrap-styled/redux": "^1.0.0"
   },
   "publishConfig": {
     "registry": "https://registry.npmjs.org",