Remove dependencies on classnames as we use it only once and the logi…

…c is simple enough

classnames is great, but including it for using it one time is a bit
overkill
Also for #85

package.json

@@ -21,7 +21,6 @@
     "url": "https://github.com/AdeleD/react-paginate/issues"
   },
   "dependencies": {
-    "classnames": "^2.2.5",
     "prop-types": "^15.6.1"
   },
   "peerDependencies": {

react_components/PaginationBoxView.js

@@ -2,8 +2,6 @@
 
 import React, { Component } from 'react';
 import PropTypes from 'prop-types';
-import classNames from 'classnames';
-
 import PageView from './PageView';
 import BreakView from './BreakView';
 
@@ -227,11 +225,8 @@ export default class PaginationBoxView extends Component {
     const { selected } = this.state;
 
     let disabled = disabledClassName;
-    const previousClasses = classNames(previousClassName,
-                                       {[disabled]: selected === 0});
-
-    const nextClasses = classNames(nextClassName,
-                                   {[disabled]: selected === pageCount - 1});
+    const previousClasses = previousClassName + (selected === 0 ? ' disabled' : '');
+    const nextClasses = nextClassName + (selected === pageCount - 1 ? ' disabled' : '');
 
     return (
       <ul className={containerClassName}>

yarn.lock

@@ -1437,10 +1437,6 @@ class-utils@^0.3.5:
     isobject "^3.0.0"
     static-extend "^0.1.1"
 
-classnames@^2.2.5:
-  version "2.2.5"
-  resolved "https://registry.yarnpkg.com/classnames/-/classnames-2.2.5.tgz#fb3801d453467649ef3603c7d61a02bd129bde6d"
-
 cli-cursor@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/cli-cursor/-/cli-cursor-1.0.2.tgz#64da3f7d56a54412e59794bd62dc35295e8f2987"