In this MWE
\documentclass[]{article}
\usepackage{amsmath}
\usepackage{booktabs}%added 8/16/2019
\setlength\heavyrulewidth{0.5ex}
\begin{document}
\small
\begin{tabular}[c]{|p{1.5in}|p{4in}|}
\toprule
Problem&1\\\hline
ODE &${\frac {\rm d}{{\rm d}x}}y \left( x \right) =1+2\,x$\\\hline
ODE degree &1\\\hline
Number of solutions &1\\\hline
CAS classification &quadrature\\\hline
Program classification&{\footnotesize [separable]}\\\hline
Solved? &yes\\\hline
Verified? &yes\\
\bottomrule
\end{tabular}
\normalsize
\end{document}
I need to close the gap shown in the output:

How to modify the above MWE to close these gaps?
Using TL 2019

