Fix all-days events not showing correctly (Update react-big-calendar)

This fixes #6.

Reference ticket in upstream:
https://github.com/intljusticemission/react-big-calendar/issues/680

package.json

@@ -11,7 +11,7 @@
     "moment": "^2.19.3",
     "node-rsa": "^0.4.2",
     "react": "^16.2.0",
-    "react-big-calendar": "^0.17.0",
+    "react-big-calendar": "^0.18.0",
     "react-datetime": "^2.11.1",
     "react-dom": "^16.2.0",
     "react-redux": "^5.0.6",

yarn.lock

@@ -4585,9 +4585,9 @@ rc@^1.0.1, rc@^1.1.6, rc@^1.1.7:
     minimist "^1.2.0"
     strip-json-comments "~2.0.1"
 
-react-big-calendar@^0.17.0:
+react-big-calendar@^0.18.0:
-  version "0.17.0"
+  version "0.18.0"
-  resolved "https://registry.yarnpkg.com/react-big-calendar/-/react-big-calendar-0.17.0.tgz#2c3cb0a660bf2ee22610453cbf123a886ffae6f1"
+  resolved "https://registry.yarnpkg.com/react-big-calendar/-/react-big-calendar-0.18.0.tgz#7a05735367289995023245b7b41c27d443cae54c"
   dependencies:
     classnames "^2.1.3"
     date-arithmetic "^3.0.0"
@@ -4597,7 +4597,7 @@ react-big-calendar@^0.17.0:
     prop-types "^15.5.8"
     react-overlays "^0.7.0"
     react-prop-types "^0.4.0"
-    uncontrollable "^3.3.1 || ^4.0.0"
+    uncontrollable "^4.0.0"
     warning "^2.0.0"
 
 react-datetime@^2.11.1:
@@ -5835,7 +5835,7 @@ uid-number@^0.0.6:
   version "0.0.6"
   resolved "https://registry.yarnpkg.com/uid-number/-/uid-number-0.0.6.tgz#0ea10e8035e8eb5b8e4449f06da1c730663baa81"
 
-"uncontrollable@^3.3.1 || ^4.0.0":
+uncontrollable@^4.0.0:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/uncontrollable/-/uncontrollable-4.1.0.tgz#e0358291252e1865222d90939b19f2f49f81c1a9"
   dependencies: