title: could not find function "unnest_tokens"
body: <p>I'm trying to split a column into tokens using the tokenizers package but I keep receiving an error: could not find function "unnest_tokens". I am using R 3.5.3 and have installed and reinstalled dplyr, tidytext, tidyverse, tokenizers, tidyr, but still keep receiving the error. </p>
  
  <p>I have also quit and restarted R and RStudio. </p>
  
  <pre><code>comments_tidy &lt;- comments %&gt;%
    unnest_tokens(word, txt) %&gt;% #Break the comments into individual words
    filter(!word %in% undesirable_words) %&gt;% #Remove undesirables
    anti_join(stop_words) #Data provided by the tidytext package
  </code></pre>
  
  <p>I receive the following: </p>
  
  <blockquote>
    <p>Error in unnest_tokens(., word, txt) :<br>
    could not find function "unnest_tokens"</p>
  </blockquote>